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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1120 (Disc Brake System) >> Repair Instructions >> Front 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 new Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid 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 Front Brake Caliper Replacement (RWD)  or Front Brake Caliper Replacement (AWD) .
  2. Drain the brake fluid from the brake caliper.
    3. Fig 1: View Of C-Clamp Over Body Of Brake Caliper
    GM794254Courtesy 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.
  3. Place a 25 mm (1 in) block of wood between the caliper and the piston.
  4. Install a large C-clamp over the body of the brake caliper with the C-clamp ends against the rear of the caliper body and against the block of wood.
  5. Carefully remove the brake caliper piston by directing low pressure compressed air into the brake caliper inlet hole.
  6. Remove the C-clamp from the caliper.
  7. Remove the block of wood from the caliper.
  8. Install clean cloths to pad the interior of the caliper housing between the remaining caliper piston and the caliper body.
  9. To cover the open caliper bore place a 25 mm (1 in) block of wood between the caliper body and the brake caliper dust boot seal.
  10. Install a large C-clamp over the body of the brake caliper with the C-clamp ends against the rear of the caliper body and against the block of wood.
  11. Carefully remove the brake caliper piston by directing low pressure compressed air into the brake caliper inlet hole.
  12. Remove the C-clamp form the caliper.
  13. Remove the block of wood from the caliper.
    14. Fig 2: View of Piston Seals - Front
    GM806399Courtesy of GENERAL MOTORS CORP.
  14. Remove the piston dust boot seals (2) from the seal counter-bores in the brake caliper and discard the boot seals.
  15. Using a small wooden or plastic tool, remove the piston seals (1) from the brake caliper bores and discard the piston seals.
    16. Fig 3: View Of Brake Caliper Bleeder Valve
    GM1201165Courtesy of GENERAL MOTORS CORP.
  16. Remove the brake caliper bleeder valve cap.
  17. Remove the brake caliper bleeder valve (1).
  18. Remove the brake caliper bleeder valve seal (2) and discard.
    19. Fig 4: Inspecting Brake Caliper Mounting Bracket Guide Surfaces
    GM171985Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use abrasives to clean the brake caliper pistons.
  19. Inspect the brake caliper mounting bracket guide surfaces for corrosion and wear. Remove and replace the brake caliper mounting bracket if damaged or worn.
  20. Clean the brake caliper piston bores and seal counter-bores with denatured alcohol, or equivalent.
  21. Clean the brake caliper pistons with denatured alcohol, or equivalent.
  22. Dry the caliper piston bores and counter-bores with non-lubricated, filtered air.
  23. Dry the brake caliper pistons with non-lubricated, filtered air.
  24. Inspect the caliper bores for cracks, scoring, pitting, excessive corrosion.
  25. If light corrosion is present in the caliper bores, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
  26. If cracks, scoring, pitting, and excessive corrosion are present in the caliper bores, replace the caliper assembly.
  27. Inspect the caliper pistons for cracks, scoring, and/or damage. Replace the caliper pistons if any of these conditions exist.
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