Frontier SC King Cab 4WD V6-3.3L SC (VG33ER) (2001)
Vacuum Brake Booster: Testing and Inspection
OPERATING CHECK
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Depress brake pedal several times with engine off. After exhausting vacuum, make sure there is no change in pedal stroke.
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Depress brake pedal, then start engine. If pedal goes down slightly, operation is normal.
AIRTIGHT CHECK
Testing Brake Booster
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Start engine, and stop it after one or two minutes. Depress brake pedal several times slowly. Booster is airtight if pedal stroke is less each time.
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Depress brake pedal while engine is running, and stop engine with pedal depressed. The pedal stroke should not change after holding pedal down
for 30 seconds.