Nissan and Datsun Workshop Service and Repair Manuals

Vacuum Brake Booster Check Valve: Testing and Inspection

INSPECTION

Hoses And Connectors

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

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.