Hydraulic System Bleeding

BLEEDING BRAKE HYDRAULIC SYSTEM:
1. Operate the parking brake completely, then start the engine.

CAUTION: The brake booster servo unit will be damaged if the bleeding operation is performed with the engine off.

2. Remove the master cylinder reservoir cap.
3. Fill the master cylinder reservoir with brake fluid. Keep the reservoir at least half full during the air bleeding operation.
4. Always use new brake fluid for replenishment.
5. In replenishing brake fluid, take care that air bubbles do not enter the brake fluid.

NOTE: When the master cylinder is replaced or overhauled, first bleed the air from the master cylinder, then from each wheel cylinder and caliper following the procedures described below.

6. Disconnect the left front wheel brake pipe from the master cylinder.
7. Depress the brake pedal slowly once and hold it depressed.
8. Seal the delivery port of the master cylinder where the pipe was disconnected with your finger, then release the brake pedal slowly.
9. Release your finger from the delivery port when the brake pedal returns completely.
10. Repeat Steps 7 through 9 until the brake fluid comes out of the delivery port during Step 7.
11. Reconnect the brake pipe to the master cylinder and tighten the pipe.
12. Depress the brake pedal slowly once and hold it depressed.
13. Loosen the left front wheel brake pipe at the master cylinder.
14. Retighten the brake pipe, then release the brake pedal slowly.
15. Repeat Steps 12 through 14 until no air comes out from the port when the brake pipe is loosened.
16. Bleed the air from the right front wheel brake pipe connection by repeating Steps 6 through 15.
17. Bleed the air from each wheel in the order listed below.
a. Left front caliper
b. Right rear wheel cylinder
c. Right front caliper
d. Left rear wheel cylinder

NOTE: If brake fluid does not come out while bleeding each caliper in the order listed above, the master cylinder may contain air in its bore. First bleed the master cylinder as described in Steps 6 through 16.

Bleeding Fluid Into Container:

18. Place the proper size box end wrench over the bleeder screw.
19. Cover the bleeder screw with a transparent tube, and submerge the free end of the transparent tube in a transparent container containing brake fluid.
20. Pump the brake pedal slowly three (3) times (once/sec), then hold it depressed.
21. Remove the air along with brake fluid by loosening the bleeder screw.
22. Retighten the bleeder screw.
23. Release the brake pedal slowly.
24. Repeat Steps 20 through 23 until the air is completely removed. it may be necessary to repeat the bleeding procedure 10 or more times for front wheels and 15 or more times for rear wheels.
25. Go to the next wheel in the sequence after each wheel is bled.
26. Depress the brake pedal to check if you feel "sponginess" after the air has been removed from all wheel cylinders and calipers. If the pedal feels "spongy", the entire bleeding procedure must he repeated.
27. After the bleeding operation is completed on each individual wheel, check the level of brake fluid in the reservoir and replenish up to the "MAX" level if necessary.
28. Attach the reservoir cap.

NOTE: If the diaphragm inside the cap is deformed, reform it and install.

29. Stop the engine.