At the service station, brakes are bled using a special device, but this operation can also be performed in the traditional way.
Sequence of works
1. Mark the brake fluid level in the reservoir.
2. Add new brake fluid to the reservoir and continue adding it as needed throughout the entire period of work. Otherwise, air will enter the system again and the work will have to be started over again.
3. Remove the rubber cap from the bleed nipple of the rear right wheel brake master cylinder.
Fig. 8.21. Bleeding the front wheel brake mechanism
4. Clean the nipple of the fitting, put a clean transparent plastic hose on it and lower its free end into the container (plastic bottle), half filled with brake fluid (Fig. 8.21).
5. Carefully loosen the bleed nipple with a ring spanner by half a turn.
6. Ask an assistant to slowly press the brake pedal all the way down to pump the brake fluid and any air out of the system. Watch the hose and the container with the brake fluid as you do so – you should notice air bubbles coming out of the fluid. Hold the brake pedal in the pressed position.
7. Close the bleed nipple, then remove your foot from the pedal. This will prevent air from entering the system through the nipple thread. Release the pedal slowly.
8. Repeat this operation until no more air bubbles are released into the fluid - this means that the air has been removed from the system. Constantly monitor the brake fluid level in the reservoir. Finally, tighten the nipple (do not tighten too much) and put a rubber cap on the nipple.
9. Repeat the same operation on the other bleed nipples in the following order: left rear wheel, right front and then left front.
10. If there was a lot of air in the system, repeat the entire procedure again.
11. After completing the work, check the fluid level in the tank again and, if necessary, add fresh fluid to the proper level.
12. Check the operation of the brakes during the test (careful) trips.