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Power Booster Vacuum Test

  1. Connect vacuum gauge to booster check valve with short length of hose and T-fitting. See Fig 1.
  2. Start and run engine at curb idle speed for one minute.
  3. Observe the vacuum supply. If vacuum supply is not adequate, repair vacuum supply.
  4. Clamp hose shut between vacuum source and check valve.
  5. Stop engine and observe vacuum gauge.
  6. If vacuum drops more than one inch Hg (33 millibars) within 15 seconds, booster diaphragm or check valve is faulty.
Fig 1: Typical Booster Vacuum Test Connections
GC0025495Courtesy of CHRYSLER LLC
1 - TEE FITTING
2 - SHORT CONNECTING HOSE
3 - CHECK VALVE
4 - CHECK VALVE HOSE
5 - CLAMP TOOL
6 - INTAKE MANIFOLD
7 - VACUUM GAUGE