BRAKE BOOST Repair Procedures

BRAKE BOOSTER OPERATION TESTS

1. 1
   Start the engine and let it run for one to two minutes, then stop it. If the pedal goes down fully on the first press but rises gradually afterward, the brake booster is operating normally. If the pedal height remains the same, the brake booster is faulty.

   

2. 2
   With the engine off, depress the brake pedal several times. Then depress the brake pedal and start the engine. If the pedal drops slightly, the booster is in good condition. If there is no change, the booster is faulty.

   

3. 3
   Start the engine, depress the brake pedal, 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 not operating. If the three previous tests are satisfactory, the brake booster performance is good. Even if one of these tests is unsatisfactory, check that the check valve, vacuum hose and brake booster operate correctly.

   

DEPOSIT

(DIRECT DRIVE)

1. 1
   Turn the ignition key to the OFF position and disconnect the negative (-) battery cable.
2. 2
   Disconnect the vacuum hose (A) from the brake booster.

   

3. 3
   Disconnect the brake fluid level switch connector from the reservoir.

   

4. 4
   Remove the master cylinder. (Refer to Brake - "Master Cylinder.")
5. 5
   Remove the hood top cover and the top panel of the cowl cover. (Refer to Body - "Cowl Top Cover")
6. 6
   Remove the safety clip and cotter pin.

   

7. 7
   Remove the locking nuts.

   Tightening torque: 16.7 ~ 26 N·m N·m

   

8. 8
   Remove the brake booster.

(LHD)

1. 1
   Turn the ignition key to the OFF position and disconnect the negative (-) battery cable.
2. 2
   Disconnect the vacuum hose (A) from the brake booster.
3. 3
   Disconnect the boost pressure sensor connector (B).

   

4. 4
   Disconnect the brake fluid level switch connector from the reservoir.

   

5. 5
   Remove the master cylinder. (Refer to Brake - "Master Cylinder.")
6. 6
   Remove the safety clip and cotter pin.

   

7. 7
   Remove the locking nuts.

   Tightening torque: 16.7 ~ 26 N·m N·m

   

8. 8
   Remove the brake booster.

Inspection

1. 1
   Check the valve in the vacuum hose.
2. 2
   Check the bellows for damage.

REMEDY

1. 1
   To install, perform the removal procedure in reverse order.
2. 2
   After installation, bleed the brake system. (Refer to Brake System - "Brake Fluid Bleeding") (Refer to Brake System - "ABS Bleeding")