Infiniti Workshop Service and Repair Manuals

Vacuum Brake Booster Check Valve: Testing and Inspection

CHECK VALVE

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Check vacuum with a vacuum pump.

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Connect pump to booster side; vacuum should exist.

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Connect pump to engine side; vacuum should not exist.

HOSES AND CONNECTORS

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Check vacuum lines, connections and check valve for airtightness, improper attachment, chafing and deterioration.