Pathfinder 2WD V6-4.0L (VQ40DE) (2009)
Vacuum Brake Booster: Procedures
Inspection
BRAKE BOOSTER
Inspection
OPERATION
With engine stopped, change vacuum to atmospheric pressure by depressing brake pedal several times. Then with brake pedal fully depressed, start
engine and when vacuum pressure reaches the standard, make sure that clearance between brake pedal and floor panel decreases.
AIR TIGHT
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Run engine at idle for approximately 1 minute, and stop it after applying vacuum to booster. Depress brake pedal normally to change vacuum to
atmospheric pressure. Make sure that distance at intervals of 5 seconds between brake pedal and floor panel gradually increases.
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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.
Vacuum Lines
VACUUM LINES
Inspection
VISUAL INSPECTION
Check for improper assembly, damage and deterioration. Replace as necessary.
CHECK VALVE INSPECTION
Airtightness Inspection
Use a suitable vacuum pump to check. Connect to brake booster side of check valve.