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Power Brake Unit Check Valve

WARNING: This page is about a different car, the 2000 Isuzu Hombre and 1999 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect vacuum hose on power brake unit side of check valve. Place finger over check valve. Start engine. If vacuum is present, go to next step. If vacuum is not present, replace check valve.
  2. Remove check valve. Apply vacuum to power brake unit side of check valve. Valve should hold vacuum. If vacuum does not hold, replace check valve.
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