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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1122 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> Brake Warning Indicator Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON. Verify that the brake warning indicator illuminates during the IPC bulb check.
    • If the brake warning indicator does not illuminate during the bulb check, replace the IPC.
  2. Observe the driver information center (DIC). Verify that the BRAKE FLUID message is not displayed.
    • If the BRAKE FLUID message is displayed, then refer to Circuit/System Testing Circuit/System Testing: BRAKE FLUID Message and Brake Warning Indicator Always On.
  3. Apply the parking brake. Verify that the brake warning indicator illuminates.
    • If the brake warning indicator does not illuminate, then refer to Circuit/System Testing Circuit/System Testing: Brake Warning Indicator Inoperative when Park Brake is Applied.
  4. Release the parking brake. Verify that the brake warning indicator turns off.
    • If the brake warning indicator does not turn off, then refer to Circuit/System Testing Circuit/System Testing: Brake Warning Indicator Always On.
  5. Remove all of the brake fluid from the master cylinder reservoir. Wait 30 seconds. Verify that the brake warning indicator illuminates on the IPC.
    • If the brake warning indicator does not illuminate, then refer to Circuit/System Testing Circuit/System Testing: Brake Warning Indicator Inoperative when Brake Fluid is Low.
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