GM Service Manual Online
For 1990-2009 cars only

Important: The following steps must be completed before using the symptom tables.

  1. Perform Diagnostic System Check - Hydraulic Brakes before using the brake indicator symptom tables in order to verify that all of the following are true:
  2. • There are no DTCs set.
    • The control module(s) can communicate via the serial data link.
  3. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
  4. •  Brake Fluid and Brake Fluid Handling
    •  Brake Warning System Description and Operation

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the Brake Warning System. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Inspect the master brake fluid reservoir for the proper brake fluid level. Refer to Master Cylinder Reservoir Filling .

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Brake Warning Indicator Always On
    •  Brake Warning Indicator Inoperative
    •  Brake Pulsation
    •  Brake System Noise
    •  Braking Action Uneven - Pulls to One Side
    •  Brake Pedal Excessive Travel
    •  Brake Pedal Excessive Effort
    •  Brakes Drag
    •  Brake System Slow Release
    •  Brake Fluid Leak