Power Booster Check Valve Test

Disconnect vacuum hose from check valve.
Remove check valve and valve seal from booster.
Use a hand operated vacuum pump for test.
Apply 15-20 inches vacuum at large end of check valve. See Figure.
Vacuum should hold steady. If gauge on pump indicates vacuum loss, check valve is faulty and should be replaced.

Fig 1: Typical - Vacuum Check Valve & Seal

Courtesy of CHRYSLER LLC

1 - BOOSTER CHECK VALVE

2 - APPLY TEST VACUUM HERE

3 - VALVE SEAL