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Ensure that the measurements are only taken within the friction surfaces and that the 4. Calculate the difference between the highest and lowest thickness measurement recorded to obtain the amount of thickness variation. 5. Compare the thickness variation measurement to the following specifications: Specification - JD9, JF3, JF7, JH6, JH7 Front and JH6, JH7 Rear: Brake rotor Specification - JD9 Rear: Brake rotor maximum allowable thickness variation: 6. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement. BRAKE ROTOR SURFACE AND WEAR INSPECTION 1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake Pads Replacement (JH6, JH7) or 2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner. 3. Inspect the friction surfaces of the brake rotor for the following Braking Surface Conditions: Heavy rust and/or pitting Light surface rust can be removed with an abrasive disc. Heavy surface rust and/or IMPORTANT: Whenever a brake rotor is refinished or replaced, the assembled lateral runout (LRO) of the rotor must be CAUTION: Refer to Brake Dust Caution .
2008 Chevrolet Silverado 1500 2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Cracks and/or heat spots Excessive blueing discoloration 4. If the friction surfaces of the brake rotor exhibit one or more of the Braking Surface Conditions, the rotor requires refinishing or replacement.
2008 Chevrolet Silverado 1500 2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 3: Measuring Brake Rotor Thickness 5. Using a micrometer calibrated in thousanths-of-a-millimeter, or ten-thousanths-of-an-inch, measure and record the scoring depth of any grooves present on the rotor friction surfaces. 6. Compare the groove scoring depth recorded to the following specification: Specification: Brake rotor maximum allowable scoring: 1.50 mm (0.059 in) 7. If the brake rotor scoring depth exceeds the specification, or if an excessive amount of scoring is present, the rotor requires refinishing or replacement. BRAKE ROTOR ASSEMBLED LATERAL RUNOUT MEASUREMENT Tools Required J 39544-KIT Torque-Limiting Socket Set, or equivalent. See Special Tools. J 41013 Rotor Resurfacing Kit. See Special Tools. J 42450-A Wheel Hub Resurfacing Kit. See Special Tools. J 45101 Hub and Wheel Runout Gage. See Special Tools. J 45101-100 Conical Brake Rotor Washers. See Special Tools. 1. Matchmark the position of the brake rotor to the wheel studs if this has not been done already. CAUTION: Refer to Brake Dust Caution . IMPORTANT: Brake rotor assembled lateral runout (LRO) exceeding the Brake rotor thickness variation MUST be checked BEFORE
2008 Chevrolet Silverado 1500 2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Inspect the mating surface of the hub/axle flange and the brake rotor to ensure that there are no foreign particles, corrosion, rust, or debris remaining. If the wheel hub/axle flange and/or 1. Remove the brake rotor from the vehicle. Refer to Front Brake Rotor Replacement (JH6, JH7)Front Brake Rotor Replacement (JD9, JF3, JF7) and/or Rear Brake 2. Using the J 42450-A , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. See Special Tools. 3. Using the J 41013 , thoroughly clean any rust or corrosion from the mating surface of the brake rotor. See Special Tools. 4. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner. 3. Install the rotor to the hub/axle flange using the matchmark made prior to removal. IMPORTANT: Whenever the brake rotor has been separated from the hub/axle flange, any rust or contaminants should be cleaned
2008 Chevrolet Silverado 1500 2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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