S80 T6 Executive L6-2.8L Turbo VIN 90 B6284T (2001)
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