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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Base Brakes (Service Information) >> Hydraulic/Mechanical >> Booster, Power Brake >> Diagnosis And Testing >> Diagnosis And Testing - Master Cylinder/Power Booster >> Power Booster Vacuum Test

Power Booster Vacuum Test

  1. Connect a vacuum gauge to the booster check valve with a short length of hose and T-fitting.
  2. Start and run the engine at curb idle for one minute.
  3. Observe the vacuum supply. If the vacuum supply is less than 406 millibars (12 inHg), repair the vacuum supply.
  4. Clamp the hose shut between the intake vacuum source and the check valve.
  5. Stop the engine and observe the vacuum gauge.
  6. If the vacuum drops more than 33 millibars (1 inHg) within 15 seconds, the booster diaphragm or check valve is faulty.
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