Axiom 2WD V6-3.5L (2002)
Vacuum Brake Booster Check Valve: Testing and Inspection
Inspection and Repair
Vacuum Hose (The built in check valve)
1. Inspect the check valve (2), which is installed inside the vacuum hose.
2. Air should pass freely from the vacuum booster (3) to the engine (1).
3. Air should not pass from the engine (1) to the vacuum booster (3). If it does, the check valve is inoperative and the vacuum hose built in the check
valve must be replaced.