Replacing brake fluid (BMW 3 Series E30)

Brake fluid absorbs moisture from the air through the pores of the brake hoses and through the ventilation hole in the expansion tank cap, so over time the boiling point of the brake fluid decreases. Under heavy loads on the brake system, steam bubbles can form in the pipes, which greatly impairs the operation of the brake system.

Brake fluid should be replaced once a year regardless of mileage, preferably in the spring.

Exercise caution when handling brake fluid.

Suck out the brake fluid from the reservoir to a level of approximately 10 mm.

Caution: Do not empty the expansion tank completely, as this may allow air to enter the brake system.

Fill the reservoir with new brake fluid up to the MAX mark.

Place a clean hose on the air bleed valve of the right rear brake caliper and place a container underneath.

Open the air release valve and pump the brake pedal about 10 times.

Close the air bleed valve. Add new brake fluid to the expansion tank.

In the same way, pump out the old brake fluid from the remaining brake calipers.

Caution: The flowing liquid must be clear and free of bubbles.

Take old brake fluid to your local special waste collection point.

You can read the original on the website: BMWMAN.ru