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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> Brake Warning Indicator Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Verify the park brake is released and the brake fluid is at or above the proper level.
  2. Command the IPC display test with a scan tool, the warning indicator should turn ON then OFF.
    • If the red brake warning indicator does not illuminate, replace the IPC.
  3. Ignition ON, observe the scan tool BCM Park Brake Switch parameter while applying and releasing the park brake. The parameter should cycle between Applied and Release.
    • If the parameter does not cycle between the specified values, refer to Circuit/System Testing for Park Brake Switch Malfunction.
  4. Observe the scan tool IPC Brake Fluid parameter. The reading should be OK.
    • If the parameter does not cycle between the specified values, refer to Circuit/System Testing  for Brake Fluid Level Switch Malfunction.
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