Toyota Corolla 2004 Repair Manual - BRAKE BOOSTER ASSY

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BRAKE BOOSTER ASSY

ON–VEHICLE INSPECTION

–BRAKE BRAKE BOOSTER ASSY

320IF–01

GOOD NO GOOD

3rd

2nd

1st

BR2238

BR2237

1. INSPECT BRAKE BOOSTER

(a) Airtightness check.

(1) Start the engine and stop it after 1 or 2 minutes. De-

press the brake pedal several times slowly.
HINT:
If the pedal goes down farthest at the 1st time, but gradually
rises after the 2nd or 3rd time, the booster is airtight.

(2) Depress the brake pedal while the engine is run-

ning, and stop the engine with the pedal depressed.
HINT:
If there is no change in the pedal reserve distance after holding
the pedal for 30 seconds, the booster is airtight.

(b) Operating check.

(1) Depress the brake pedal several times with the igni-

tion switch OFF and check that there is no change

in the pedal reserve distance.

(2) Depress the brake pedal and start the engine.
HINT:
If the pedal goes down slightly, operation is normal.

2. INSPECT VACUUM CHECK VALVE

(a) Check vacuum check valve.

(1) Slide the clip and disconnect the vacuum hose.

(2) Remove the vacuum check valve.

Ventilation No Ventilation

2004 COROLLA (RM1037U)

(3) Check that there is ventilation from the booster to

engine, and no ventilation from the engine to the
booster.

(4) If any fault is found, replace the vacuum check

valve.

F40007

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