This information applies to 2007-08 full-size pickups and utilities (1500 models), and 2005-07 Silverado and Sierra Classic with RPO JF3 or JF7.
Some owners may comment on a scored appearance of the front brake rotors. This scoring could be caused by the composition of the front brake lining. The brake lining formula has ingredients to clean rust off the rotor braking surface. Scoring may be a side effect.
The scored appearance is normal as long as no other symptoms are experienced, such as pulsation, roughness or noise, and the scoring does not exceed the specification in SI document 1476240.
SI specs include new thickness, minimum thickness after machining, discard thickness, maximum lateral runout and maximum score depth.
TIP: Scoring requires repair if the depth is in excess of 0.060-inch (1.5 mm) measured with with a brake micrometer/caliper.
TIP: When doing any brake repair, it's a good idea to print a copy of the specification sheet and attach it to the repair order.
- Thanks to Jim Will and Ken Peacock
Some owners may comment on a scored appearance of the front brake rotors. This scoring could be caused by the composition of the front brake lining. The brake lining formula has ingredients to clean rust off the rotor braking surface. Scoring may be a side effect.
The scored appearance is normal as long as no other symptoms are experienced, such as pulsation, roughness or noise, and the scoring does not exceed the specification in SI document 1476240.
SI specs include new thickness, minimum thickness after machining, discard thickness, maximum lateral runout and maximum score depth.
TIP: Scoring requires repair if the depth is in excess of 0.060-inch (1.5 mm) measured with with a brake micrometer/caliper.
TIP: When doing any brake repair, it's a good idea to print a copy of the specification sheet and attach it to the repair order.
- Thanks to Jim Will and Ken Peacock
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