Volvo Workshop Service and Repair Manuals

Vacuum Brake Booster: Testing and Inspection

Vacuum system, checking

Preparation

Disconnect the battery lead

See Battery, disconnecting See: Starting and Charging/Battery/Service and Repair/Procedures/Battery, Disconnecting.

Check the vacuum hose

Check:

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the vacuum hose connections at the manifold and the check valve

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that the vacuum hose is not crimped or rubbing anywhere

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that the vacuum hose inner weave has not broken and blocked the through flow.

Disconnect the hose. Start the engine. Check the vacuum.

Preparations for checking the check valve