- Ring wrench for air release valve.
- Brake fluid specification SAE J 1703 DOT 3 or DOT 4.
Through the pores in the brake hoses, the brake fluid absorbs moisture from the air. Because of this, the boiling point of the brake fluid decreases over time. When the brakes are heavily loaded, this results in the formation of steam bubbles in the brake pipeline, which drastically reduces the braking efficiency.
Brake fluid is best changed in the spring.
- Take precautions when handling brake fluid, see 18.10.
- Suck off the brake fluid from the reservoir with a suction device to a level of about 10 mm.
Attention: Do not empty the tank completely so that air does not get into the system.
- Fill the reservoir with new brake fluid up to the MAX mark.
Caution: Open the bleed valves on the wheel cylinders and brake calipers carefully so as not to twist them. It is recommended to spray them with a rust remover 2 hours before removing the air. If it is impossible to return them, contact the service station.
- Attach a clean hose to the air release valve at the rear left wheel and place a vessel of suitable capacity.
- Have an assistant press the brake pedal several times until the required pressure is created. Leave your foot on the pedal, open the valve. Close the valve, when the pedal goes down to the stop, take your foot off the pedal. Repeat this process with each bleed valve until only new brake fluid comes out. The new brake fluid has a lighter color.
- Close the air release valve, fill the compensation tank with new brake fluid.
- In the same way, pump out the old brake fluid from the remaining brake calipers and wheel cylinders, in the following sequence - rear left, rear right, front right, front left.
Attention: The escaping liquid must be clear and free of air bubbles.