Tacoma PreRunner Dbl Cab 2WD V6-3.4L (5VZ-FE) (2001)
/Page-824001.png)
Vacuum Brake Booster: Testing and Inspection
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 1st time, but gradually rises after the 2nd or 3rd time, the booster is air tight.
(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 air tight.
