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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 330 (Mechanical Brake System - Base (Service Information)) >> Hydraulic/Mechanical >> BOOSTER, Power Brake >> Diagnosis and Testing >> Master Cylinder/Power Booster >> Power Booster Vacuum Test

Power Booster Vacuum Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  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 that 12 inches HG (406 millibars), 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 one inch HG (33 millibars) within 15 seconds, the booster diaphragm or check valve is faulty.
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