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Power Booster Check Valve Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating Power Booster Check Valve & Valve Seal
GC0006315Courtesy of DAIMLERCHRYSLER CORP.
  1. Disconnect vacuum hose from check valve (1).
  2. Remove check valve (1) and valve seal (2) from booster (3).
  3. Use a hand operated vacuum pump for test.
  4. Apply 15-20 inches vacuum at large end of check valve.
  5. Plug off the small end to prevent vacuum leakage.
  6. Vacuum should hold steady. If gauge on pump indicates vacuum loss, check valve is faulty and should be replaced.
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