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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 251 (Disc Brake System) >> Repair Instructions >> Rear Brake Caliper Overhaul >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

Do not place fingers in front of the caliper piston(s) in an attempt to catch or protect it when applying compressed air. The piston(s) can fly out with force and could result in serious bodily injury.

NOTE:
  • Replace all the components included in the repair kits used to service this brake caliper.
  • Lubricate the rubber parts with GM approved 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 (JE5, J55) Rear Brake Caliper Replacement (J6G) .
  2. Drain the brake fluid from the brake caliper.
    3. Fig 1: Brake Caliper Piston
    GM2201930Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    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 housing 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 (1) 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. Fig 2: Piston Dust Boot Seal
    GM2201931Courtesy of GENERAL MOTORS COMPANY
  8. Remove the brake caliper piston dust boot seal (1) from the seal counterbore in the brake caliper and discard the dust boot seal.
    9. Fig 3: Piston Seal
    GM2201934Courtesy of GENERAL MOTORS COMPANY
  9. Using a small wooden or plastic tool, remove the brake caliper piston seal (1) from the brake caliper bore and discard the piston seal.
    10. Fig 4: Brake Caliper Bleeder Valve & Cap
    GM2201935Courtesy of GENERAL MOTORS COMPANY
  10. Remove the brake caliper bleeder valve cap (1) and bleeder valve (2).
    11. NOTE:

    Do not use abrasives to clean the brake caliper pistons.

  11. Inspect the brake caliper mounting bracket guide surfaces for corrosion and wear. Remove and replace the brake caliper mounting bracket if damaged or worn.
  12. Clean the brake caliper piston bores and seal counterbore with denatured alcohol, or equivalent.
  13. Clean the brake caliper piston with denatured alcohol, or equivalent.
  14. Dry the caliper piston bore and counterbore with non-lubricated, filtered air.
  15. Dry the brake caliper piston with non-lubricated, filtered air.
  16. Inspect the caliper bore for cracks, scoring, pitting, excessive corrosion.
  17. 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.
  18. If cracks, scoring, pitting, and excessive corrosion are present in the caliper bore, replace the caliper assembly.
  19. Inspect the caliper piston for cracks, scoring, and/or damage. Replace the caliper piston if any of these conditions exist.
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