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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1355 (Base Brakes (Service Information)) >> Hydraulic/Mechanical >> Master Cylinder, Brake >> Diagnosis And Testing >> Master Cylinder/Power Booster >> Power Booster Check Valve Test

Power Booster Check Valve Test

WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the power booster check valve from the power booster.
  2. Using a hand operated vacuum pump, apply 15-20 inches HG (508-677 millibars) vacuum at the booster side of the check valve.
  3. The vacuum should hold steady. If the gauge on the pump indicates vacuum loss, the check valve is faulty and should be replaced.
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