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Check Valve & Power Booster Vacuum

  1. Disconnect vacuum hose from check valve. Remove check valve and seal from booster. Using a hand-held vacuum pump, apply 15-20 in. Hg at large end of check valve. If gauge on pump indicates any vacuum loss, valve is faulty and must be replaced. If gauge holds steadily, proceed to next step.
  2. Reinstall check valve and seal onto power booster. Install a vacuum "T" into vacuum hose between power booster and vacuum source. Connect vacuum gauge. Run engine at idle for one minute. Clamp hose shut between vacuum source and power booster.
  3. Stop engine, and observe vacuum gauge. If vacuum drops more than one in. Hg within 15 seconds, booster diaphragm, check valve, or check valve seal/grommet is faulty. Replace as required.
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