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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1457 (Disc Brake System) >> Repair Instructions >> Brake Caliper Overhaul - Rear >> Disassembly Procedure

Disassembly Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain all the brake fluid from the caliper.
  2. Pad the interior of the caliper with clean shop towels.
    3. CAUTION: Do not place your fingers in front of the piston in order to catch or protect the piston while applying compressed air. This could result in serious injury.
    NOTE: Use just enough air pressure to ease the piston out of the bore. You can damage a blown-out piston even with the padding.
    Fig 1: Removing Piston From Caliper Bore
    GM399353Courtesy of GENERAL MOTORS CORP.
  3. Remove the piston from the caliper bore.
    4. Fig 2: Removing Boot From Caliper Bore
    GM406916Courtesy of GENERAL MOTORS CORP.
  4. Remove the boot from the caliper bore. Do not scratch the housing bore.
    5. Fig 3: Removing/Installing Piston Seal
    GM311224Courtesy of GENERAL MOTORS CORP.
  5. Remove the piston seal from the caliper bore. Do not use a metal tool.
    6. Fig 4: Removing Bleeder Valve & Bleeder Valve Cap From Caliper Body
    GM311142Courtesy of GENERAL MOTORS CORP.
  6. Remove the bleeder valve and bleeder valve cap from the caliper body.
  7. Remove the guide pins and guide pin sleeves from the anchor bracket.
  8. Clean the following components with denatured alcohol.
    • The bleeder valve
    • The caliper bore
    • The caliper passages
    • The piston
    • The lining contact area on the anchor bracket.
  9. Dry the parts and blow out the brake fluid passages. Use dry and filtered compressed air.
  10. Replace the piston or the caliper if any of the following conditions exist:
    • Scoring on the piston surface or in the caliper bore
    • Corrosion on the piston
    • Chrome plating damage on the piston
    • Corrosion in the caliper bore. Use crocus cloth in order to polish light corrosion from the caliper bore. Replace the caliper if the corrosion cannot be removed.
    • Pitting in the caliper bore
    11. NOTE: Refer to Fastener Notice in Cautions and Notices.
  11. Replace the bleeder valve cap.

    Tighten:  Tighten the bleeder valve to 12 N.m (110 lb in).

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