Frontier SE King Cab 4WD L4-2.4L (KA24DE) (1998)
Vacuum Brake Booster: Testing and Inspection
Air-Tight 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.