GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 2WD 🢒 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. Notice: Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

  4. Remove the rotor. Refer to Rear Brake Rotor Replacement .
  5. Remove the axle shaft. Refer to Rear Axle Shaft Replacement in Rear Drive Axle.
  6. Remove the park brake shoe. Refer to Parking Brake Shoe Replacement .

    7. Object Number: 370688 Size: SH
  7. Remove the backing plate nuts.
  8. Remove the backing plate from axle housing flange.

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

    2. Object Number: 370688 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 65 N·m (48 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 .
  7. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  8. Remove the safety stands.
  9. Lower vehicle.
  10. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
  11. Slowly release the brake pedal.
  12. Wait 15 seconds, then repeat steps 13-14 until a firm brake pedal is obtained. This will properly seat the brake caliper pistons and brake pads.
  13. Adjust park brake cable. Refer to Park Brake Adjustment .