Warning: Protect your eyes when bleeding the brake system. If brake fluid gets into your eyes, rinse immediately with plenty of water and seek medical attention.
1. Bleeding the brake system is necessary to remove air that gets into the system during repairs. Use only specialized brake fluid for the system, otherwise it can be seriously damaged. If air got into the system due to a low brake fluid level or disconnection of the brake hoses from the master cylinder, then all four brakes should be bled.
2. If the line was disconnected on only one wheel, then only that caliper (or wheel cylinder) needs to be bled.
3. If the pipe connector between the master cylinder and one of the brakes has become disconnected, it is necessary to bleed the part of the system that is served by the disconnected pipe.
4. By pressing the brake pedal several times with the engine off, eliminate any possible pressure drop in the brake booster.
5. Remove the master cylinder reservoir cap, fill the reservoir with brake fluid. Reinstall the cap.
Note: When bleeding the brakes, check the fluid level frequently and add fluid if necessary to keep the level within normal limits.
6. You will need an assistant, as well as a supply of fresh brake fluid, a clean plastic container, a piece of clean 4.8 mm (3/16 inch) diameter plastic tubing, and a wrench to open and close the bleed nipple.
7. Starting from the right rear wheel, loosen the nipple slightly, then tighten it until it is tightly closed, but opens quickly and easily.
8. Place one end of the tube on the nipple and lower the other into the brake fluid poured into the container (see figure).
11.8. When bleeding the brakes, the hose is connected to the fitting, and its other end is lowered into clean brake fluid - air will be visible as bubbles in the container and hose (it is necessary to remove all air before moving on to the next wheel).
1. Bleed nipple.
2. Clean brake fluid.
9. Have an assistant pump the brakes several times to build up pressure in the system, then press the pedal all the way down.
10. With the pedal pressed, open the bleeder valve until the fluid starts to flow. Watch for air bubbles rising from the end of the tube lowered into the fluid. When the fluid flow slows down after a couple of seconds, close the valve and ask your assistant to release the pedal.
11. Repeat the procedures in paragraphs 9 and 10 until all air bubbles disappear from the inlet pipe during bleeding, then tighten the bleeder screw, then move to the left front wheel, left rear wheel and right front wheel in this order, repeat the above procedure. Check the fluid level in the brake master cylinder reservoir frequently.
12. Never use drained brake fluid.
13. At the end of the procedure, refill the master cylinder.
14. Check the operation of the brakes. The brake pedal should feel firm and without pulsation. Repeat the entire process if necessary.
Warning: Do not operate the vehicle if there is any doubt about the effectiveness of the braking system.