Passport LX 2WD V6-3.2L SOHC (6VD1) (1997)
Vacuum Brake Booster Check Valve: Testing and Inspection
Inspecting Check Valve
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Inspect the check valve, which is located inside the vacuum hose.
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Air should pass freely from the vacuum booster to the engine.
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Air should not pass freely from the engine to the vacuum booster. If it does, the check valve is inoperative and must be replaced.
NOTE: The check valve is a non-serviceable part of the vacuum hose, if defective the hose should be replaced.