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Home >> Fiat >> 2017 >> 500 Lounge, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Base Brakes (Service Information) - 500 - Electric) >> Hydraulic/Mechanical >> Booster, Power 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 variant/trim than selected.
  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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