Vacuum Brake Booster Check Valve: Testing and Inspection

VACUUM HOSE CHECK VALVE INSPECTION (POWER BRAKE UNIT)

1. Remove the clamps and vacuum hose (power brake unit side).





2. For engine side, insert a small flathead screwdriver in the direction of the arrow shown in the figure, push the ring down and remove the vacuum hose. (L3, L3 WITH TC)
3. Remove the clamps and vacuum hose (engine side). (AJ)





4. Apply both suction and pressure to the engine side hose, and verify that air blows only toward that side.
^ If air flows in both directions or not at all, replace the vacuum hose.