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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 53 (Disc Brakes & Drum Brakes) >> Adjustments & Inspections >> Hydraulic Brake Component Operation Visual Inspection >> Disc Brake

Disc Brake

WARNING: This page is about a different car, the 2003 Buick Regal, 2003 Buick Century, 2002 Buick Regal, and 2002 Buick Century. 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 (2) 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 (4), observe the position of the caliper piston (1) 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.
    • Observe the caliper piston (1) for unrestricted and even movement during each apply of the brake system (5). See Fig 1 .
    • Observe the caliper piston (1) for an unrestricted and even return motion during each release of the brake system (6). See Fig 1 .
  5. If the caliper piston (1) did not exhibit unrestricted and even movement during brake system apply and/or release, the piston square seal (3) may be worn or damaged and the caliper may require overhaul or replacement. See Fig 1 .
Fig 1: Inspecting Disc Brake Operation
G00284620Courtesy of GENERAL MOTORS CORP.
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