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For 1990-2009 cars only

Right Rear Inner Brake Pad Wear (Install Rear Wheel Mud Flaps)

Subject:Right Rear Inner Brake Pad Wear (Install Rear Wheel Mud Flaps)

Models:1999-2004 Chevrolet Silverado 1500 Series Pickup Models
1999-2004 GMC Sierra 1500 Series Pickup Models



This bulletin is being revised to change the content from Informational to Technical. Please discard Corporate Bulletin Number 00-05-23-005A (Section 05 - Brakes).


Condition

Some customers and dealers may comment on accelerated rear brake wear on some of the above listed vehicles. This condition occurs mainly on the right rear inboard brake pads and on vehicles that are exposed to extensive off-paved roads.

Correction

Install a mud flap forward of each rear wheel using the following procedure. Installation of these mud flaps and following the recommended off-road driving information provided in the vehicle's Owner's Manual should greatly reduce the possibility of accelerated rear brake component wear.

Important: Always work from outboard to inboard, drilling one hole at a time and securing with a fastener. Follow the sequence of the procedure. This will prevent distortion of the mud flap.

  1. Raise the vehicle. Support the vehicle.
  2. Locate the pickup box side panel rear brace.
  3. Remove the existing outboard upper fastener on the brace.
  4. Install the mud flap through the "V" of the brace. Install the previously removed fastener in the hole (2) of the mud flap to the brace. Do not tighten the fastener at this time.

  5. Object Number: 674793  Size: MF
  6. Using the mud flap as a template, locate and mark the location of the hole (1) in the pickup box wheelhouse.
  7. Important: After drilling the holes, apply the appropriate anti-corrosion primer. Refer to the GM Refinish Material Booklet #4901M-D (English) or #4901-D-F (French) for additional information.

  8. Center punch the marked location and drill a 6.35 mm (1/4 in) hole. Install the plastic retainer in the hole (1) of the mud flap.
  9. Tighten fastener at the hole (2) location of the mud flap.
  10. Tighten
    Tighten the fastener to 25 N·m (18 lb ft).


    Object Number: 674802  Size: MF
  11. For vehicles with short box, use the following procedure:
  12. 8.1. Push the mud flap to make contact with the rear side of the underbody cross sill and mark the location of the hole (3) of the mud flap.
    8.2. Center punch the marked location and drill a 5.159 mm (13/64 in) hole.
    8.3. Install the screw.

    Tighten
    Tighten the screw to 4 N·m (35 lb in).

    8.4. Repeat the above steps for hole locations 4 and 6.

    Object Number: 674813  Size: MF
  13. For vehicles with long box, use the following procedure:
  14. 9.1. Push the mud flap to make contact with the front side of the underbody cross sill and mark location of the hole (5) of the mud flap.
    9.2. Center punch the marked location and drill a 5.159 mm (13/64 in) hole.
    9.3. Install the screw.

    Tighten
    Tighten the screw to 4 N·m (35 lb in).

    9.4. Repeat the above steps for hole location 6.
  15. Repeat the above steps for the opposite side.

Parts Information

Part Number

Description

Qty

15765007

Flap Package - Rear Mud

1

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

B7787*

Flap Package, Rear Mud -- Install (Both)

0.6 hr

*This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.