For on-vehicle inspection procedure, see Fig. 7
2002-04 BRAKES Disc - Sequoia
BRAKE BOOSTER ASSEMBLY ON-VEHICLE INSPECTION
1. OPERATING CHECK
(a) Depress the brake pedal several times with the engine off and check that there is no change in the pedal reserve distance.
(b) Depress the brake pedal and start the engine. If the pedal goes down slightly, operation is normal.
2. AIR TIGHTNESS CHECK
(a) Start the engine and stop it after 1 or 2 minutes. Depress the brake pedal several times slowly.
If the pedal goes down farthest the 1 st time, but gradually rises after the 2nd or 3rd time, the booster is airtight.
(b) Depress the brake pedal while the engine is running, and stop the engine with the pedal depressed. If there is no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is airtight.
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