GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Aveo 🢒 Brakes 🢒 Drum Brakes 🢒 Wheel Cylinder Overhaul

Disassembly Procedure

    Object Number: 1245742 Size: SH

    Caution: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:

       • Eye contact - rinse thoroughly with water.
       • Skin contact - rinse with soap and water.
       • If ingested - consult a physician immediately.

  1. Remove the wheel cylinder assembly from the backing plate. Refer to Wheel Cylinder Replacement .
  2. Twist off the boots, the pistons, and the seals from each end of the wheel cylinder.
  3. Remove the spring assembly.

    4. Object Number: 1245743 Size: SH
  4. Remove the bleeder cap and the bleeder valve.

Assembly Procedure

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1245742 Size: SH
  1. Inspect the wheel cylinder bore and the pistons for scoring, nicks, corrosion, and wear.

    2. Important: If the bore will not clean up with a crocus cloth, replace the assembly.

  2. Use a crocus cloth to polish out light corrosion in the wheel cylinder bore.

    3. Object Number: 1245743 Size: SH
  3. Clean all the parts in clean denatured alcohol or brake fluid. Dry all the parts with unlubricated compressed air and lubricate the new seals, the pistons, and the wheel cylinder bore with clean brake fluid before assembly.
  4. Thinly coat all the parts except the dust caps wit brake cylinder fluid.
  5. Fasten the bleeder valve and the cap to the wheel cylinder.

    6. Object Number: 1245742 Size: SH
  6. Attach to the wheel cylinder the spring assembly, followed by the pistons, the seals, and the boots.
  7. Inspect the pistons for free movement.
  8. Install the wheel cylinder assembly. Refer to Wheel Cylinder Replacement .