GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Astro - 4WD 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Rear Disc Brake Backing Plate Replacement

Removal Procedure
  1. Release the park brake.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  4. Relieve the tension from the park brake cables by loosening the nut at the equalizer.
  5. Remove the park brake cable from the mounting bracket by depressing the locking tabs.
  6. Remove the rear park brake cable from the park brake actuator lever.
  7. Remove the rotor. Refer to Rear Brake Rotor Replacement in Disc Brakes.
  8. Remove the axle shaft. Refer to Rear Axle Shaft Replacement in Rear Drive Axle.
  9. Remove the park brake shoe. Refer to Parking Brake Shoe Replacement .

    10. Object Number: 370684 Size: SH
  10. Remove the backing plate nuts.
  11. Remove the backing plate from axle housing flange.

Installation Procedure
  1. Install the backing plate to the axle housing flange.

    2. Object Number: 370684 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.

  2. Install the backing plate nuts.

    3. Tighten
    Tighten the backing plate bolts to 135 N·m (100 lb ft).

  3. Install the park brake shoe. Refer to Parking Brake Shoe Replacement .
  4. Install the axle shaft. Refer to Rear Axle Shaft Replacement in Rear Drive Axle.
  5. Adjust the park brake shoe. Refer to Park Brake Adjustment .
  6. Install the rotor. Refer to Rear Brake Rotor Replacement in Disc Brakes.
  7. Install the rear park brake cable to the park brake actuator lever.
  8. Install the park brake cable to the mounting bracket until the locking tabs snap into place.
  9. Tighten the nut to the intermediate cable at the equalizer.

    10. Tighten
    Tighten the nut to 3.5 N·m (31 lb in).

  10. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  11. Remove the safety stands.
  12. Lower vehicle.
  13. Adjust park brake cable. Refer to Park Brake Adjustment .