| Subject: | Scored Appearance On Front Brake Rotors |
| Models: | 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2005-2007 Chevrolet Silverado Classic with RPO JF3 or JF7 |
| 2005-2007 GMC Sierra Classic with RPO JF3 or JF7 |
| 2007-2008 GMC Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL |
This PI is being superseded to update modelyears. Please discard PIT4049A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment on a scored appearance of the front brake rotors. This scoring could be caused by the make up of the front brake lining. The brake lining formula has ingredients to clean rust off the rotor braking surface. This cleaning feature
of the rotor braking surface may have a side effect of scoring.
Recommendation/Instructions:
This scored appearance is normal as long as no other symptoms are experienced such as pulsation, roughness, noise, and the scoring does not exceed the specification in SI Doc ID 1476240.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
