Brake fluid handling

The brake fluid is poisonous and hygroscopic and requires careful handling. Driving safety depends on the condition and quality of the brake fluid. Therefore, the brake fluid must be regularly checked and changed. Failure to do so may result in damage to the hydraulic braking system and a safety hazard.

During each engine oil change, the brake fluid level is inspected. If it is below the minimum level in the tank, it is necessary to identify and correct the cause of the low liquid level. It is common for the brake fluid to be replenished only when the brakes are being repaired or serviced.

Brake fluid DOT4

Brake fluid has hygroscopic properties, which means that it absorbs moisture from its environment. When the brake fluid is saturated with moisture, its boiling point is lowered and the risk of brake system failure at extreme loads increases.

The brake fluid should be stored in the original container in a clean, dry place at or below room temperature, preferably separate from similar storage of petroleum products or liquid materials used for maintenance. Always use the original packaging, which should be tightly closed to avoid water absorption.

Important notes when handling brake fluid:

  • Brake fluid is toxic and belongs to special waste;
  • Caution when replacing;
  • Damages varnishes and plastics. Always rinse spilled liquid with water;
  • Store the old liquid in special packaging and do not mix with old oil;
  • The color of the brake fluid does not indicate quality;
  • Brake fluid should be stored in a dry, cool, and well-ventilated place.

To select, operate, store and fill the brake fluid to the appropriate level, follow these steps:

Information on the type of brake fluid

See which type of brake fluid is used in the service information system for a given vehicle.

Check brake fluid level

Wipe the master cylinder reservoir cover to prevent moisture or dirt from entering the hydraulic part of the brake system. The fluid should be close to the full mark or about 1.5 cm from the top of each chamber when there is no mark. If the brake fluid level is not close to the full mark, you will need to identify the cause of the lower level.

Adding brake fluid

When you are sure that there is no problem with fluid loss, add the recommended brake fluid to bring the level to the full mark.

Closing the reservoir

Replace the cover and check that it is installed correctly. Check for any leaks or problems around the master cylinder. Dilute spilled brake fluid with clean water. Do not rub the brake fluid, as this may damage the paint.

See also

Video recommendation