GM Service Manual Online
For 1990-2009 cars only

Disassembly Procedure


    Object Number: 171475  Size: SH
  1. Remove the wheel cylinder (14) from the vehicle. Refer to Wheel Cylinder Replacement .

  2. Object Number: 171484  Size: SH
  3. Remove the wheel cylinder boots (4).
  4. Remove the wheel cylinder pistons (3) and seals (2).
  5. Remove the wheel cylinder spring assembly (5).
  6. Remove the wheel cylinder bleeder valve (6).
  7. Inspect the cylinder bore (1) and pistons (3) for the following conditions:
  8. • Scoring
    • Nicks
    • Corrosion
    • Wear
  9. Use a crocus cloth in order to polish out light corrosion. Replace the wheel cylinder assembly if the bore does not clean up using the crocus cloth.
  10. Clean all the parts in clean, denatured alcohol.
  11. Dry the parts with unlubricated, compressed air.
  12. Caution: Avoid taking the following actions when you service wheel brake parts:

       • Do not grind brake linings.
       • Do not sand brake linings.
       • Do not clean wheel brake parts with a dry brush or with compressed air.
    Some models or aftermarket brake parts may contain asbestos fibers which can become airborne in dust. Breathing dust with asbestos fibers may cause serious bodily harm. Use a water-dampened cloth in order to remove any dust on brake parts. Equipment is available commercially in order to perform this washing function. These wet methods prevent fibers from becoming airborne.

    Notice: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid from contacting these areas. Always re-seal and wipe off brake fluid containers to prevent spills.

  13. Lubricate the new seals (2) with clean brake fluid.

Assembly Procedure


    Object Number: 171484  Size: SH

    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.

  1. Install the bleeder valve (6).
  2. Tighten
    Tighten the bleeder valve to 7 N·m (62 lb in).

  3. Install the spring assembly (5).
  4. Install the following components:
  5. • Seals (2)
    • Pistons (3)
    • Boots (4)
  6. Install the wheel cylinder to the vehicle. Refer to Wheel Cylinder Replacement .