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Disc Brake Operational Inspection

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the tire and wheel assemblies removed and the brake rotors retained by wheel lug nuts, visually inspect the caliper piston dust boot sealing area to ensure that there are no brake fluid leaks. See Fig 1 .
  2. If any evidence of a brake fluid leak is present, the brake caliper requires overhaul or replacement.
  3. While the brake system is at rest, observe the position of the caliper piston in relation to the caliper housing. See Fig 1 .
  4. Have an assistant apply and release the brake pedal several times while you observe the operation of the hydraulic brake caliper.
    1. Observe the caliper piston for unrestricted and even movement during each apply of the brake system. See Fig 1 .
    2. Observe the caliper piston for an unrestricted and even return motion during each release of the brake system. See Fig 1 .
  5. If the caliper piston did not exhibit unrestricted and even movement during brake system apply and/or release, the piston square seal may be worn or damaged and the caliper may require overhaul or replacement.
Fig 1: Inspecting Disc Brake Component Operation
G00072437Courtesy of GENERAL MOTORS
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