RIGHT REAR CALIPER on Silverado

fireball · August 21, 2005

I know that this has probably been posted before but I would like some opinions on what people have done to combat the,what I would consider,extreme wear on the RR brake on the Silverado/Sierra trucks.Mine is wearing about 2 sets of pads on this side to 1 on the other and its to the point that I'm concidering blocking the fluid flow to this caliper off just to see if the other side will start and wear a bit more.It acts as though more fluid or pressure is being sent to this one caliper instead of it being equal on both.I may just see if I can find a caliper to try on it and see if there's any change but I'm looking for ideas from any and all who've experienced this.

GM-Tech · August 22, 2005

?Like I posted above mine is acting as though the pressure isnt bleeding of when the brake is released causing the extra wear.

It's certainly within the realm of possibility, however, I believe it is very remote.

You may nave never heard of this fix before, but what does that mean? Do you work in a dealership and keep up with the dozens upon dozens of TSBs that are released every month?

GM doesn't issue these TSB's lightly. They're only released once they've fully investigated a problem and and have come up with a correction. The problem here is that in off-road conditions, or even on road conditions (remember, the right wheels are near the edge of the road where most debris resides), crud is thrown from the front wheel to the rear. This abrasive results in accelerated wear on the right rear brake shoes, which are basically exposed to these elements.

I'm not trying to give you a hard time here. This is a known issue. Whether you want to consider this problem/fix as a possibility is really up to you, I guess. I just offered it up as a real possibility. I can't diagnose your problem from here.

GM-Tech · August 21, 2005

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

#00-05-23-005B - (May 27, 2003)

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.

Raise the vehicle. Support the vehicle.

Locate the pickup box side panel rear brace.

Remove the existing outboard upper fastener on the brace.

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.

Using the mud flap as a template, locate and mark the location of the hole (1) in the pickup box wheelhouse.

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.

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.

Tighten fastener at the hole (2) location of the mud flap.

Tighten

Tighten the fastener to 25 N·m (18 lb ft).

For vehicles with short box, use the following procedure:

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.

Center punch the marked location and drill a 5.159 mm (13/64 in) hole.

Install the screw.

Tighten

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

Repeat the above steps for hole locations 4 and 6.

For vehicles with long box, use the following procedure:

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.

Center punch the marked location and drill a 5.159 mm (13/64 in) hole.

Install the screw.

Tighten

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

Repeat the above steps for hole location 6.

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.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

fireball · August 23, 2005

Cool.Thanks for the explanation.I'll print this off and take it to my dealer and see if they've got this info and try this.

fireball · August 22, 2005

Thanks for the reply.I cant say as I've ever heard of this particular fix before but I was wondering if you could explain just what the mud flap is supposed to do.Is it there to direct cooling air to the caliper or what?Like I posted above mine is acting as though the pressure isnt bleeding of when the brake is released causing the extra wear.Thanks.