Repair Procedures

Brake Booster Operating Test

For simple checking of the brake booster operation, carry out the following tests.
1. Run the engine for one or two minutes, and then turn the engine off. If the pedal depresses fully the first time but gradually becomes higher when depressed successive times, the booster is operating properly. If the pedal height remains unchanged, the booster is inoperative.




2. With the engine turned off, step on the brake pedal several times to bleed off any vacuum in the booster.
Then step on the brake pedal and start the engine. If the pedal moves downward slightly, the booster is in good condition. If there is no change, the booster is inoperative.




3. With the engine running, step on the brake pedal and then stop the engine.Hold the pedal depressed for 30 seconds. If the pedal height does not change, the booster is in good condition, if the pedal rises, the booster is inoperative.
If these three tests are okay, the booster performance can be determined as good.
If one or more of the tests are not okay, check the check valve, vacuum hose and booster for malfunction.






Removal

1. Turn ignition switch OFF and disconnect the negative (-) battery cable
2. Remove the air cleaner assembly (A).




3. Disconnect the vacuum hose from the brake booster.
4. Remove the master cylinder.
5. Remove the snap pin (A) and clevis pin (B).




6. Remove the mounting nuts.

Tightening torque:
12.7 - 15.7 N.m (1.3 - 1.6 kgf.m, 9.4 - 11.6 lb-ft)




7. Remove the ESC control module.
8. Remove the brake booster(A).






Inspection

1. Inspect the check valve in the vacuum hose.

CAUTION:
Do not remove the check valve from the vacuum hose.

2. Check the boot for damage.

Installation

1. Installation is the reverse of removal.

CAUTION:
- Before installing the pin, apply the grease to the joint pin.
- Use a new snap pin whenever installing.

2. Adjust the brake pedal height and free play.

3. After installing, bleed the brake system.