GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Park Avenue 🢒 Brakes 🢒 Disc Brakes 🢒 Rear Brake Caliper Overhaul

    Object Number: 105774 Size: SH
  1. Remove the rear brake caliper from vehicle. Refer to Rear Brake Caliper Replacement
  2. Remove the brake caliper piston and piston boot by turning the piston (2) counterclockwise using a spanner type wrench.

    3. Object Number: 517729 Size: SH

    Important: Do NOT use a metal tool for the removal of the boot ring or the piston seal.

  3. Remove the brake caliper boot ring from the groove in the brake caliper bore with a small wooden or plastic tool.

    4. Object Number: 517749 Size: SH
  4. Remove the piston seal with a small wooden or plastic tool.

    5. Object Number: 517735 Size: SH
  5. Remove the piston boot from the piston.

    6. Object Number: 517733 Size: SH
  6. Remove the bleeder valve from the caliper body.

    7. Important: The park brake lever, lever return spring and seal are the only components in the park brake mechanism that can be removed or replaced. Do not disassemble the park brake mechanism. Replace the caliper if the park brake is damaged or inoperative.

  7. Replace the lever return spring if damaged.

    8. Important: Replace the caliper piston if any of the internal parts are damaged.

  8. The brake caliper piston is replaced as an assembly.

    9. Object Number: 517748 Size: SH
  9. Clean all of the parts with denatured alcohol.
  10. Dry all of the parts with low pressure, non-lubricated, filtered air.
  11. Blow out all of the passages in the caliper body and the bleeder valve.

    12. Important: The piston sliding surface is plated. Do not polish with emery paper.

  12. Inspect and replace the brake caliper piston if any of the following conditions are found:
    13. • Corrosion
    • Nicks
    • Scoring
    • Worn or damaged chrome plating

    Important: Use new brake fluid to clean the caliper cylinder, do not use mineral oil.

    Minor damage from light rust or foreign objects may be eliminated by polishing the cylinder surface with a fine emery paper.

  13. Inspect the inside surface of the cylinder for scoring, rust, wear, damage, or presence of foreign objects. Replace the caliper body if any of these conditions have occurred.

    14. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  14. Install the bleeder valve in the brake caliper body.

    15. Tighten
    Tighten the bleeder valve to 13 N·m (115 lb in).


    Object Number: 517749 Size: SH
  15. Lubricate the new piston seal with clean brake fluid .
  16. Install the piston seal in the caliper bore.

    17. Object Number: 517735 Size: SH
  17. Install the new boot on the piston.

    18. Object Number: 105774 Size: SH
  18. Screw the piston (2) into the caliper body (1) using a spanner type wrench.

    19. Object Number: 517755 Size: SH
  19. Install the boot ring inside the caliper counterbore against the piston boot.
  20. Install the caliper onto the vehicle. Refer to Rear Brake Caliper Replacement