Replacement and bleeding of the brake fluid can be done under pressure. A hand pump with a tank is used for that. The advantage of this method is that you can replace the brake fluid on your own without an assistant. The pressure bleeding equipment consists of a canister, a manual pump for creating pressure in the canister, a manometer, and a cover with a hose that replaces the cover of the brake fluid reservoir.
Pressure brake bleeding and flushing kit
Find out in the information system or manual what type and amount of brake fluid are required for a given vehicle.
Clean the brake fluid reservoir cover and the area around it. We remove the lid and put the lid with the hose from the canister in its place. When we have made sure that the lid with the hose is well placed, we raise the air pressure in the empty canister to 1 bar with the help of a hand pump. Once again, check the lid for air leaks and monitor the manometer. If the created pressure is constant, we lower the pressure in the canister, open it and add new appropriate brake fluid. It is to pour 0.3 to 0.5 liters of more brake fluid than the required amount into the canister. We close the lid and use the pump to re-create the pressure in the canister at 1 to 1.2 bar maximum because higher pressure can damage the internal seals in the brake system.
Replacement of brake fluid under pressure
Brake fluid replacement starts from the brake unit to the point furthest from the master cylinder. We place a hose on the bleeding valve. The other end of the hose is in a transparent container. We open the valve by unscrewing the screws a quarter to a half turn. We follow the brake fluid that flows into a transparent vessel. When the brake fluid is clear and there are no more bubbles, we close the bleeding valve.
Repeat the brake fluid replacement procedure for each brake unit by moving towards the master brake cylinder.
After the brake fluid replacement procedure, start the engine and check that the brake pedal is firm when a vacuum brake booster is in function.
To replace the brake fluid under pressure, follow these steps:
Preparing for replacement
Connect an empty canister to the brake fluid reservoir. Use a hand pump to create a pressure of 1 bar and check for leaks. If the seal is good, lower the pressure and pour the appropriate type and amount of brake fluid into the canister. Pump again to create a pressure of 1 – 1.2 bar.
Replacement
Place a hose and a container for draining the brake fluid on the farthest brake unit. Unscrew the bleeding valve and monitor the drained brake fluid. When the liquid is clear and is no more bubbles, close the bleeding valve. Remove the hose from the valve.
Repeat the procedure
Repeat the brake fluid replacement procedure for each brake unit by moving towards the master brake cylinder. Periodically check brake fluid level and canister pressure.
Check the brake system
After replacing the brake fluid, lower the pressure in the canister, remove the hose cap, and return the original cap to the tank. Start the engine and, by depressing the brake pedal, check that there is no decay and that the pedal is firm.
See also
Video recommendation
