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HEY ALL! UPON INSPECTING MY FRONT AND REAR BRAKES TODAY. I WAS ALARMED WHEN I LOOKED AT MY REAR DISCS !!! I HAVE 25000 MILES ON MY TRUCK . THE REAR DISCS HAVE MANY LINES SCORED IN THEM ALL ACROSS THE DISC ON BOTH SIDES INSIDE AND OUT THEY ARE SO DEEP YOU CAN REALLY FEEL THEM WITH YOUR FINGER NAIL, I PULLED OFF MY WHEELS AND I HAVE OVER AN 1/2 INCH OF PAD!!! WHATS UP WITH THAT???? THIS CANT BE NORMAL CAN IT!!! ALSO MY FRONT BRAKES ARE NICE AND SMOOTH BUT I NOTICED A BUNCH OF LITTLE CRACKES IN THE DISCS BOTH SIDES WHAT GIVES!!! IF I AM DRIVEING AROUND TOWN AND SLOWLY BRAKE I FEEL A PULSE FEELING IF I HIT THEM HARDER ITS NOT THERE WHAT DO YOU GUYS THINK.
 

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If you are feeling a pulse in the brake pedal most likely the rotors are warped and need to be resurfaced, commonly caused by improper lug nut torque. There is a bulletin that might help you on the rear brakes. Apparently debris gets kicked up into the brakes. The small cracks are normal.
<H1>Right Rear Inner Brake Pad Wear (Install Rear Wheel Mud Flaps) #00-05-23-005B - (05/27/2003)</H1>


</TABLE>Right Rear Inner Brake Pad Wear (Install Rear Wheel Mud Flaps)


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).<A name=ss1-1336875><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1336875&pubid=271#ss1-1336875" target="_blank">
<H5>Condition</A></H5>


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.<A name=ss2-1336875><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1336875&pubid=271#ss2-1336875" target="_blank">
<H5>Correction</A></H5>


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.



<H4>Important</H4>


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. <LI ="1">Raise the vehicle. Support the vehicle.
    <LI ="1">Locate the pickup box side panel rear brace.
    <LI ="1">Remove the existing outboard upper fastener on the brace.
    <LI ="1">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.



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



    <H4>Important</H4>


    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.



    <LI ="1">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.
    <LI ="1">Tighten fastener at the hole (2) location of the mud flap. Tighten


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



    <LI ="1">For vehicles with short box, use the following procedure:

    1. <LI ="A">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.
      <LI ="A">Center punch the marked location and drill a 5.159 mm (13/64 in
 
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