{"id":9037,"date":"2019-09-01T22:46:20","date_gmt":"2019-09-01T20:46:20","guid":{"rendered":"https:\/\/autoedu.info\/auto-mechanic\/brakes\/hydraulic-braking-system\/2163-2\/"},"modified":"2022-11-15T21:37:56","modified_gmt":"2022-11-15T20:37:56","slug":"testing-vacuum-check-valve","status":"publish","type":"page","link":"https:\/\/autoedu.info\/en\/auto-mechanic\/brakes\/hydraulic-braking-system\/testing-vacuum-check-valve\/","title":{"rendered":"Testing the vacuum check valve"},"content":{"rendered":"<div id=\"tdi_1\" class=\"tdc-row\"><div class=\"vc_row tdi_2  wpb_row td-pb-row\" >\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_2,\r\n                .tdi_2 .tdc-columns{\r\n                    min-height: 0;\r\n                }.tdi_2,\r\n\t\t\t\t.tdi_2 .tdc-columns{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_2 .tdc-columns{\r\n\t\t\t\t    width: 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\"display:inline-block;width:320px;height:100px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});<\/script>\n<noscript id=\"td-ad-placeholder\"><\/noscript><\/div>\n\n <!-- end A --> \n\n[vc_column_text]\r\n<h1 style=\"text-align: center;\"><strong>Testing the vacuum check valve<\/strong><\/h1>\r\nWhen there is an internal vacuum leak from the power booster, one of the possible causes is a malfunction of the vacuum check valve. The power booster receives vacuum from external sources such as the engine intake line or vacuum pump. The vacuum is delivered to the power booster by a vacuum line.\r\n\r\nThe power booster should preserve the obtained vacuum until the first braking. However, the delivered vacuum can be lost through the same vacuum line in the opposite direction when the vacuum source has a higher pressure or when it is not working. That is why there is a vacuum check valve between the vacuum source and the servo device. The vacuum check valve passes the vacuum only in the direction from the source to the servo device. Blocks the opposite movement of the vacuum of power booster to the source.[\/vc_column_text][vc_single_image image=&#8221;9042&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; media_size_image_height=&#8221;200&#8243; media_size_image_width=&#8221;300&#8243; size=&#8221;contain&#8221; height=&#8221;40%&#8221;][vc_column_text]\r\n<p style=\"text-align: center;\">The vacuum check valve<\/p>\r\n[\/vc_column_text]\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-sidebar tdi_6 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_6.td-a-rec{\r\n\t\t\t\t\ttext-align: center;\r\n\t\t\t\t}.tdi_6.td-a-rec:not(.td-a-rec-no-translate){\r\n\t\t\t\t    transform: 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\"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});<\/script>\n<noscript id=\"td-ad-placeholder\"><\/noscript><\/div>\n\n <!-- end A --> \n\n[vc_column_text]A faulty vacuum check valve does not hold the vacuum and leaks it from the servo device, which results in a harder brake pedal and difficult braking. Testing is performed in two steps.\r\n\r\nThe engine is started for 30 seconds to fill the power booster with a vacuum. Wait 10 minutes after turning off the engine and remove the check valve from the power booster. After removing the valve there should be a strong rush of air into the power booster, which is a sign that the check valve is holding a vacuum.\r\n\r\nHowever, if there is no air surge after the removal of a check valve, a vacuum leaks from the power booster. A faulty check valve can cause a loss of vacuum. We remove the check valve and let air in or create a vacuum at both ends of the valve. The correct check valve should leak in one direction and block the movement of air in the other. If the check valve leaks air in both directions, should be replaced with a new one.[\/vc_column_text][vc_single_image image=&#8221;9039&#8243; img_size=&#8221;400&#215;214&#8243; alignment=&#8221;center&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; media_size_image_height=&#8221;200&#8243; media_size_image_width=&#8221;300&#8243; size=&#8221;contain&#8221; height=&#8221;40%&#8221;][vc_column_text css=&#8221;.vc_custom_1629145129975{margin-bottom: 0px !important;padding-top: 10px !important;padding-bottom: 0px !important;}&#8221;]\r\n<p style=\"text-align: center;\">Testing the vacuum check valve<\/p>\r\n[\/vc_column_text]\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-sidebar tdi_7 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv 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!important;padding-bottom: 0px !important;}\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_11{\r\n                    position: relative !important;\r\n                    top: 0;\r\n                    transform: none;\r\n                    -webkit-transform: none;\r\n                }.tdi_11,\r\n\t\t\t\t.tdi_11 .tdc-inner-columns{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_11 .tdc-inner-columns{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column_inner vc_custom_1546699675319 tdi_13  wpb_column vc_column_container tdc-inner-column td-pb-span4\">\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1546699675319{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_13{\r\n                    vertical-align: baseline;\r\n                }.tdi_13 .vc_column-inner > .wpb_wrapper,\r\n\t\t\t\t.tdi_13 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_13 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\" >[vc_single_image image=&#8221;1760&#8243; alignment=&#8221;center&#8221; onclick=&#8221;img_link_large&#8221; media_size_image_height=&#8221;169&#8243; media_size_image_width=&#8221;300&#8243; size=&#8221;&#8221; width=&#8221;100%&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; height=&#8221;100%&#8221;]<\/div><\/div><\/div><div class=\"vc_column_inner vc_custom_1547277311732 tdi_15  wpb_column vc_column_container tdc-inner-column td-pb-span8\">\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1547277311732{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;padding-left: 0px !important;}\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_15{\r\n                    vertical-align: baseline;\r\n                }.tdi_15 .vc_column-inner > .wpb_wrapper,\r\n\t\t\t\t.tdi_15 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_15 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\" >[vc_column_text css=&#8221;.vc_custom_1629145181698{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]<strong><u><img decoding=\"async\" class=\"alignnone wp-image-904\" src=\"https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-1-480-300x300.png\" sizes=\"(max-width: 40px) 100vw, 40px\" srcset=\"https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-1-480-300x300.png 300w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-1-480-150x150.png 150w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-1-480-356x364.png 356w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-1-480.png 480w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-1-480-420x420.png 420w\" alt=\"\" width=\"40\" height=\"40\" align=\"absmiddle\" \/>Vacuum holding check\r\n<\/u><\/strong>\r\n\r\nStart the engine and switch it off after 30 s. After 10 min, remove the check valve from the power booster. If a strong rush of air into the power booster occurs after removing the check valve, there is no vacuum leak. If there is no air surge, there is a vacuum leak and a valve check is approached.[\/vc_column_text]<\/div><\/div><\/div><\/div><div class=\"wpb_wrapper td_block_separator td_block_wrap vc_separator vc_custom_1547273226249 tdi_17  td_separator_solid td_separator_center\"><span style=\"border-color:orange;border-width:1px;width:100%;\"><\/span>\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1547273226249{margin-top: 10px !important;margin-bottom: 10px !important;}\n<\/style><\/div><div class=\"vc_row_inner vc_custom_1547186073072 tdi_19  vc_row vc_inner wpb_row td-pb-row\" >\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1547186073072{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_19{\r\n                    position: relative !important;\r\n                    top: 0;\r\n                    transform: none;\r\n                    -webkit-transform: none;\r\n                }.tdi_19,\r\n\t\t\t\t.tdi_19 .tdc-inner-columns{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_19 .tdc-inner-columns{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column_inner vc_custom_1546699675319 tdi_21  wpb_column vc_column_container tdc-inner-column td-pb-span4\">\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1546699675319{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_21{\r\n                    vertical-align: baseline;\r\n                }.tdi_21 .vc_column-inner > .wpb_wrapper,\r\n\t\t\t\t.tdi_21 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_21 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\" >[vc_single_image image=&#8221;1760&#8243; alignment=&#8221;center&#8221; onclick=&#8221;img_link_large&#8221; media_size_image_height=&#8221;169&#8243; media_size_image_width=&#8221;300&#8243; size=&#8221;&#8221; width=&#8221;100%&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; height=&#8221;100%&#8221;]<\/div><\/div><\/div><div class=\"vc_column_inner vc_custom_1547277311732 tdi_23  wpb_column vc_column_container tdc-inner-column td-pb-span8\">\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1547277311732{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;padding-left: 0px !important;}\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_23{\r\n                    vertical-align: baseline;\r\n                }.tdi_23 .vc_column-inner > .wpb_wrapper,\r\n\t\t\t\t.tdi_23 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_23 .vc_column-inner > .wpb_wrapper .tdc-elements{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\" >[vc_column_text css=&#8221;.vc_custom_1629145252531{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]<strong><u><img decoding=\"async\" class=\"alignnone wp-image-905\" src=\"https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-2-480-300x300.png\" sizes=\"(max-width: 40px) 100vw, 40px\" srcset=\"https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-2-480-300x300.png 300w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-2-480-150x150.png 150w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-2-480-356x364.png 356w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-2-480.png 480w, https:\/\/autoedu.info\/wp-content\/uploads\/2019\/01\/icons8-2-480-420x420.png 420w\" alt=\"\" width=\"40\" height=\"40\" align=\"absmiddle\" \/>Testing the vacuum check valve\r\n<\/u><\/strong>\r\n\r\nRemove the check valve. Let air through both ends of the valve. If the valve leaks air in only one direction, then it is correct. If it leaks air in both directions then it is defective and replaces with a new valve.[\/vc_column_text]<\/div><\/div><\/div><\/div><div class=\"wpb_wrapper td_block_separator td_block_wrap vc_separator vc_custom_1547273226249 tdi_25  td_separator_solid td_separator_center\"><span style=\"border-color:orange;border-width:1px;width:100%;\"><\/span>\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* tdc_composer_block - inline css att *\/\n.vc_custom_1547273226249{margin-top: 10px !important;margin-bottom: 10px !important;}\n<\/style><\/div><\/div><\/div><div class=\"vc_column tdi_27  wpb_column vc_column_container tdc-column td-pb-span4\">\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_27{\r\n                    vertical-align: baseline;\r\n                }.tdi_27 > .wpb_wrapper,\r\n\t\t\t\t.tdi_27 > .wpb_wrapper > .tdc-elements{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_27 > .wpb_wrapper > .tdc-elements{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}.tdi_27 > .wpb_wrapper > .vc_row_inner{\r\n\t\t\t\t    width: auto;\r\n\t\t\t\t}.tdi_27 > .wpb_wrapper{\r\n\t\t\t\t    width: auto;\r\n\t\t\t\t    height: auto;\r\n\t\t\t\t}\n<\/style><div class=\"wpb_wrapper\" >\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-sidebar tdi_28 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_28.td-a-rec{\r\n\t\t\t\t\ttext-align: center;\r\n\t\t\t\t}.tdi_28.td-a-rec:not(.td-a-rec-no-translate){\r\n\t\t\t\t    transform: translateZ(0);\r\n\t\t\t\t}.tdi_28 .td-element-style{\r\n\t\t\t\t\tz-index: -1;\r\n\t\t\t\t}.tdi_28.td-a-rec-img{\r\n\t\t\t\t    text-align: left;\r\n\t\t\t\t}.tdi_28.td-a-rec-img img{\r\n                    margin: 0 auto 0 0;\r\n                }.tdi_28 .td_spot_img_all img,\r\n\t\t\t\t.tdi_28 .td_spot_img_tl img,\r\n\t\t\t\t.tdi_28 .td_spot_img_tp img,\r\n\t\t\t\t.tdi_28 .td_spot_img_mob img{\r\n\t\t\t\t    border-style: none;\r\n\t\t\t\t}@media (max-width: 767px) {\r\n\t\t\t\t    .tdi_28.td-a-rec-img {\r\n\t\t\t\t        text-align: center;\r\n\t\t\t\t    }\r\n                }\n<\/style><script type=\"text\/javascript\">\nvar td_screen_width = window.innerWidth;\nwindow.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1140 ) {\r\n\t\t\t        \r\n\t\t\t        \/* large monitors *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1019  && td_screen_width < 1140 ) {\r\n\t\t\t    \r\n\t\t\t        \/* landscape tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t      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    \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width < 768 ) {\r\n\t\t\t    \r\n\t\t\t        \/* Phones *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});<\/script>\n<noscript id=\"td-ad-placeholder\"><\/noscript><\/div>\n\n <!-- end A --> \n\n[vc_column_text css=&#8221;.vc_custom_1629145984744{margin-bottom: 0px !important;padding-bottom: 0px !important;background-color: #000000 !important;}&#8221;]\r\n<p style=\"text-align: center;\"><span style=\"color: #ffffff;\">See also<\/span><\/p>\r\n[\/vc_column_text][vc_single_image image=&#8221;13604&#8243; img_size=&#8221;&#8221; alignment=&#8221;center&#8221; onclick=&#8221;custom_link&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; media_size_image_height=&#8221;200&#8243; media_size_image_width=&#8221;300&#8243; image_url=&#8221;https:\/\/autoedu.info\/&#8221; size=&#8221;contain&#8221; height=&#8221;40%&#8221; link=&#8221;https:\/\/autoedu.info\/en\/auto-mechanic\/engine\/cylinder-head-repair\/valves-and-valve-seats-inspection\/ &#8220;][vc_single_image image=&#8221;13880&#8243; img_size=&#8221;&#8221; alignment=&#8221;center&#8221; onclick=&#8221;custom_link&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; media_size_image_height=&#8221;200&#8243; media_size_image_width=&#8221;300&#8243; image_url=&#8221;https:\/\/autoedu.info\/&#8221; size=&#8221;contain&#8221; height=&#8221;40%&#8221; link=&#8221;https:\/\/autoedu.info\/en\/auto-electric\/battery\/battery-charging\/&#8221;][vc_single_image image=&#8221;13472&#8243; img_size=&#8221;&#8221; alignment=&#8221;center&#8221; onclick=&#8221;custom_link&#8221; tdc_css=&#8221;eyJhbGwiOnsibWFyZ2luLXRvcCI6IjAiLCJtYXJnaW4tYm90dG9tIjoiMCIsInBhZGRpbmctdG9wIjoiMCIsInBhZGRpbmctYm90dG9tIjoiMCIsImRpc3BsYXkiOiIifX0=&#8221; media_size_image_height=&#8221;200&#8243; media_size_image_width=&#8221;300&#8243; image_url=&#8221;https:\/\/autoedu.info\/&#8221; size=&#8221;contain&#8221; height=&#8221;40%&#8221; link=&#8221;https:\/\/autoedu.info\/en\/autoelectronic\/gasoline-injection-systems\/air-intake\/throttle-valve-sensor-test\/ &#8220;]\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-sidebar tdi_29 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_29.td-a-rec{\r\n\t\t\t\t\ttext-align: center;\r\n\t\t\t\t}.tdi_29.td-a-rec:not(.td-a-rec-no-translate){\r\n\t\t\t\t    transform: translateZ(0);\r\n\t\t\t\t}.tdi_29 .td-element-style{\r\n\t\t\t\t\tz-index: -1;\r\n\t\t\t\t}.tdi_29.td-a-rec-img{\r\n\t\t\t\t    text-align: left;\r\n\t\t\t\t}.tdi_29.td-a-rec-img img{\r\n                    margin: 0 auto 0 0;\r\n                }.tdi_29 .td_spot_img_all img,\r\n\t\t\t\t.tdi_29 .td_spot_img_tl img,\r\n\t\t\t\t.tdi_29 .td_spot_img_tp img,\r\n\t\t\t\t.tdi_29 .td_spot_img_mob img{\r\n\t\t\t\t    border-style: none;\r\n\t\t\t\t}@media (max-width: 767px) {\r\n\t\t\t\t    .tdi_29.td-a-rec-img {\r\n\t\t\t\t        text-align: center;\r\n\t\t\t\t    }\r\n                }\n<\/style><script type=\"text\/javascript\">\nvar td_screen_width = window.innerWidth;\nwindow.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1140 ) {\r\n\t\t\t        \r\n\t\t\t        \/* large monitors *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1019  && td_screen_width < 1140 ) {\r\n\t\t\t    \r\n\t\t\t        \/* landscape tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 768  && td_screen_width < 1019 ) {\r\n\t\t\t    \r\n\t\t\t        \/* portrait tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:200px;height:200px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width < 768 ) {\r\n\t\t\t    \r\n\t\t\t        \/* Phones *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});<\/script>\n<noscript id=\"td-ad-placeholder\"><\/noscript><\/div>\n\n <!-- end A --> \n\n[vc_column_text css=&#8221;.vc_custom_1629146010723{margin-bottom: 0px !important;padding-bottom: 0px !important;background-color: #000000 !important;}&#8221;]\r\n<p style=\"text-align: center;\"><span style=\"color: #ffffff;\">Video recommendation<\/span><\/p>\r\n[\/vc_column_text]\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-custom_ad_4 tdi_30 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_30.td-a-rec{\r\n\t\t\t\t\ttext-align: center;\r\n\t\t\t\t}.tdi_30.td-a-rec:not(.td-a-rec-no-translate){\r\n\t\t\t\t    transform: translateZ(0);\r\n\t\t\t\t}.tdi_30 .td-element-style{\r\n\t\t\t\t\tz-index: -1;\r\n\t\t\t\t}.tdi_30.td-a-rec-img{\r\n\t\t\t\t    text-align: left;\r\n\t\t\t\t}.tdi_30.td-a-rec-img img{\r\n                    margin: 0 auto 0 0;\r\n                }.tdi_30 .td_spot_img_all img,\r\n\t\t\t\t.tdi_30 .td_spot_img_tl img,\r\n\t\t\t\t.tdi_30 .td_spot_img_tp img,\r\n\t\t\t\t.tdi_30 .td_spot_img_mob img{\r\n\t\t\t\t    border-style: none;\r\n\t\t\t\t}@media (max-width: 767px) {\r\n\t\t\t\t    .tdi_30.td-a-rec-img {\r\n\t\t\t\t        text-align: center;\r\n\t\t\t\t    }\r\n                }\n<\/style><script type=\"text\/javascript\">\nvar td_screen_width = window.innerWidth;\nwindow.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1140 ) {\r\n\t\t\t        \r\n\t\t\t        \/* large monitors *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1019  && td_screen_width < 1140 ) {\r\n\t\t\t    \r\n\t\t\t        \/* landscape tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 768  && td_screen_width < 1019 ) {\r\n\t\t\t    \r\n\t\t\t        \/* portrait tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width < 768 ) {\r\n\t\t\t    \r\n\t\t\t        \/* Phones *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});<\/script>\n<noscript id=\"td-ad-placeholder\"><\/noscript><\/div>\n\n <!-- end A --> \n\n\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-custom_ad_5 vc_custom_1548147636293 tdi_31 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_31.td-a-rec{\r\n\t\t\t\t\ttext-align: center;\r\n\t\t\t\t}.tdi_31.td-a-rec:not(.td-a-rec-no-translate){\r\n\t\t\t\t    transform: translateZ(0);\r\n\t\t\t\t}.tdi_31 .td-element-style{\r\n\t\t\t\t\tz-index: -1;\r\n\t\t\t\t}.tdi_31.td-a-rec-img{\r\n\t\t\t\t    text-align: left;\r\n\t\t\t\t}.tdi_31.td-a-rec-img img{\r\n                    margin: 0 auto 0 0;\r\n                }.tdi_31 .td_spot_img_all img,\r\n\t\t\t\t.tdi_31 .td_spot_img_tl img,\r\n\t\t\t\t.tdi_31 .td_spot_img_tp img,\r\n\t\t\t\t.tdi_31 .td_spot_img_mob img{\r\n\t\t\t\t    border-style: none;\r\n\t\t\t\t}@media (max-width: 767px) {\r\n\t\t\t\t    .tdi_31.td-a-rec-img {\r\n\t\t\t\t        text-align: center;\r\n\t\t\t\t    }\r\n                }\n<\/style><script type=\"text\/javascript\">\nvar td_screen_width = window.innerWidth;\nwindow.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1140 ) {\r\n\t\t\t        \r\n\t\t\t        \/* large monitors *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1019  && td_screen_width < 1140 ) {\r\n\t\t\t    \r\n\t\t\t        \/* landscape tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 768  && td_screen_width < 1019 ) {\r\n\t\t\t    \r\n\t\t\t        \/* portrait tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width < 768 ) {\r\n\t\t\t    \r\n\t\t\t        \/* Phones *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:300px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});<\/script>\n<noscript id=\"td-ad-placeholder\"><\/noscript><\/div>\n\n <!-- end A --> \n\n<\/div><\/div><\/div><\/div><div id=\"tdi_32\" class=\"tdc-row\"><div class=\"vc_row tdi_33  wpb_row td-pb-row\" >\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_33,\r\n                .tdi_33 .tdc-columns{\r\n                    min-height: 0;\r\n                }.tdi_33,\r\n\t\t\t\t.tdi_33 .tdc-columns{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_33 .tdc-columns{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}.tdi_33:before,\r\n\t\t\t\t.tdi_33:after{\r\n\t\t\t\t    display: table;\r\n\t\t\t\t}\n<\/style><div class=\"vc_column tdi_35  wpb_column vc_column_container tdc-column td-pb-span12\">\n<style scoped>\n\/* custom css - generated by TagDiv Composer *\/\n\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_35{\r\n                    vertical-align: baseline;\r\n                }.tdi_35 > .wpb_wrapper,\r\n\t\t\t\t.tdi_35 > .wpb_wrapper > .tdc-elements{\r\n\t\t\t\t    display: block;\r\n\t\t\t\t}.tdi_35 > .wpb_wrapper > .tdc-elements{\r\n\t\t\t\t    width: 100%;\r\n\t\t\t\t}.tdi_35 > .wpb_wrapper > .vc_row_inner{\r\n\t\t\t\t    width: auto;\r\n\t\t\t\t}.tdi_35 > .wpb_wrapper{\r\n\t\t\t\t    width: auto;\r\n\t\t\t\t    height: auto;\r\n\t\t\t\t}\n<\/style><div class=\"wpb_wrapper\" >\n <!-- A generated by theme --> \n\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><div class=\"td-g-rec td-g-rec-id-custom_ad_2 tdi_36 td_block_template_1 \">\n\n<style>\n\/* custom css - generated by TagDiv Composer *\/\n.tdi_36.td-a-rec{\r\n\t\t\t\t\ttext-align: center;\r\n\t\t\t\t}.tdi_36.td-a-rec:not(.td-a-rec-no-translate){\r\n\t\t\t\t    transform: translateZ(0);\r\n\t\t\t\t}.tdi_36 .td-element-style{\r\n\t\t\t\t\tz-index: -1;\r\n\t\t\t\t}.tdi_36.td-a-rec-img{\r\n\t\t\t\t    text-align: left;\r\n\t\t\t\t}.tdi_36.td-a-rec-img img{\r\n                    margin: 0 auto 0 0;\r\n                }.tdi_36 .td_spot_img_all img,\r\n\t\t\t\t.tdi_36 .td_spot_img_tl img,\r\n\t\t\t\t.tdi_36 .td_spot_img_tp img,\r\n\t\t\t\t.tdi_36 .td_spot_img_mob img{\r\n\t\t\t\t    border-style: none;\r\n\t\t\t\t}@media (max-width: 767px) {\r\n\t\t\t\t    .tdi_36.td-a-rec-img {\r\n\t\t\t\t        text-align: center;\r\n\t\t\t\t    }\r\n                }\n<\/style><script type=\"text\/javascript\">\nvar td_screen_width = window.innerWidth;\nwindow.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1140 ) {\r\n\t\t\t        \r\n\t\t\t        \/* large monitors *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            placeAdEl.replaceWith(adEl);\t\r\n\t\t            adEl.setAttribute(\"class\", \"adsbygoogle\");\r\n\t\t            adEl.setAttribute(\"style\", \"display:inline-block;width:970px;height:250px\");\t            \t\t                \r\n\t\t            adEl.setAttribute(\"data-ad-client\", \"ca-pub-8428072374152349\");\r\n\t\t            adEl.setAttribute(\"data-ad-slot\", \"9005325462\");\t            \r\n\t\t\t        (adsbygoogle = window.adsbygoogle || []).push({});\r\n\t\t\t    }\r\n\t\t\t});window.addEventListener(\"load\", function(){            \r\n\t            var placeAdEl = document.getElementById(\"td-ad-placeholder\");\r\n\t\t\t    if ( null !== placeAdEl && td_screen_width >= 1019  && td_screen_width < 1140 ) {\r\n\t\t\t    \r\n\t\t\t        \/* landscape tablets *\/\r\n\t\t\t        var adEl = document.createElement(\"ins\");\r\n\t\t            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The power booster receives vacuum from external sources such as the engine intake line or vacuum pump. The vacuum is delivered to the power booster [...]","protected":false},"author":3,"featured_media":0,"parent":8751,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9037","page","type-page","status-publish"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Testing the vacuum check valve - AutoEdu - Procedure<\/title>\n<meta name=\"description\" content=\"Testing the vacuum check valve is done when there is a correct supply of the servo device with vacuum and we have a hard brake pedal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/autoedu.info\/en\/auto-mechanic\/brakes\/hydraulic-braking-system\/testing-vacuum-check-valve\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Testing the vacuum check valve - 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