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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1120 (Disc Brake System) >> Repair Instructions >> Rear Brake Caliper Overhaul >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
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.
IMPORTANT:
  • Replace all the components included in the repair kits used to service this brake caliper.
  • Lubricate the rubber parts with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container to make assembly easier.
  • If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the brake system.
  • The torque values specified are for dry, non-lubricated fasteners.
  • Perform the service operations on a clean bench, free from all mineral oil materials.
  1. Remove the brake caliper from the vehicle. Refer to Rear Brake Caliper Replacement .
    2. Fig 1: Removing Brake Caliper Piston Using Compressed Air
    GM773687Courtesy of GENERAL MOTORS CORP.
    NOTE: Use clean cloths to pad interior of caliper housing during piston removal. Use just enough air to ease the pistons out of the bores. If the pistons are blown out, even with the padding provided, it may be damaged.
  2. Remove the brake caliper piston from the caliper bore by directing low pressure compressed air into the caliper bore through the brake fluid inlet hole.
    3. Fig 2: View of Piston Seals - Rear
    GM806397Courtesy of GENERAL MOTORS CORP.
  3. Using a small wooden or plastic tool, remove the piston dust boot seal (2) from the seal counter-bore in the caliper and discard the boot seal.
  4. Using a small wooden or plastic tool, remove the piston seal (1) from the caliper bore and discard the piston seal.
    5. Fig 3: Identifying Brake Caliper Bleeder Valve
    GM869708Courtesy of GENERAL MOTORS CORP.
  5. Remove the brake caliper bleeder valve cap.
  6. Remove the brake caliper bleeder valve.
    7. Fig 4: Inspecting Brake Caliper Mounting Bracket Guide Surfaces
    GM171985Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use abrasives to clean the brake caliper piston.
  7. Inspect the brake caliper mounting bracket guide surfaces for corrosion and wear. Remove and replace the brake caliper mounting bracket if damaged or worn.
  8. Clean the brake caliper piston bore and seal counter-bore, with denatured alcohol, or equivalent.
  9. Clean the brake caliper piston with denatured alcohol, or equivalent.
  10. Dry the caliper piston bore and counter-bore, with non-lubricated, filtered air.
  11. Dry the caliper piston with non-lubricated, filtered air.
  12. Inspect the caliper bore for cracks, scoring, pitting and excessive corrosion.
  13. If light corrosion is present in the caliper bore, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
  14. If cracks, scoring, pitting and excessive corrosion are present in the caliper bore, replace the caliper assembly.
  15. Inspect the caliper piston for cracks, scoring, and/or damage. Replace the caliper piston if any of these conditions exist.
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