GM Service Manual Online
For 1990-2009 cars only

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DEFINITION: Apparent Off-On Condition

Inspect for broken or damaged hydraulic brake pipes and hoses.

Replace any faulty pipes or hoses.

Inspect the master cylinder for a low fluid level.

    • Fill reservoirs with the proper brake fluid.
    • Check for leaks.

Inspect the master cylinder for faulty seals.

Repair or replace any faulty seals.

Inspect the master cylinder for a cracked casing.

Replace the master cylinder. Refer to Master Cylinder Replacement .

Inspect the following components for leaks:

    • Front calipers
    • Rear wheel cylinders
    • Pipes
    • Connections

Repair or replace any faulty components.

Check the hydraulic system for air.

Bleed the system. Refer to Hydraulic Brake System Bleeding .