Vacuum Brake Booster Check Valve: Testing and Inspection
CHECK VALVE OPERATION CHECKRemove Vacuum Hose:
When checking the check valve, keep the check valve fit in the vacuum hose.
1. Remove the vacuum hose.
NOTE: The check valve is press-fitted inside the vacuum hose.
2. Check the operation of the check valve by using a vacuum Pump.
Vacuum Pump Connection: Accept/Reject Criteria
Connection at the brake booster side (A): A negative pressure (vacuum) is created and held.
Connection at the intake manifold side (B): A negative pressure (vacuum) is not created.
CAUTION: If the check valve is defective, replace it as an assembly unit together with the vacuum hose.