LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 1995 >> Cherokee Country, RWD, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Testing >> Power Booster >> Check Valve & Power Booster Vacuum Test

Check Valve & Power Booster Vacuum Test

  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 into power booster. Tee a vacuum gauge into vacuum hose between power booster and vacuum source. 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 or check valve is faulty. Replace as required.
scientia non olet · About LEMON Manuals