- 10mm open-end wrench for air release valves.
Consumables:
- Brake fluid specification DOT4.
Brake fluid absorbs moisture from the air through the pores of the brake hoses and through the ventilation hole in the expansion tank cap. Therefore, over time, the boiling point of the brake fluid decreases. Under heavy loads on the brake system, steam bubbles can therefore form in the pipes, which has a strong effect on the operation of the brake system.
Brake fluid should be replaced once every 2 years, 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 on the right rear brake caliper and place a container underneath.
Have the assistant press the brake pedal and hold it down.
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:
- 1. rear right wheel;
- 2. rear left wheel;
- 3. front right wheel;
- 4. front left wheel.
Caution: The flowing liquid must be clear and free of bubbles.
Take old brake fluid to your local special waste collection point.
Warning: Do not store old brake fluid in food containers or in places accessible to children. Risk of poisoning!
(Original publication posted on the website BMWman)