C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Lateral Runout Check
Leave the wheels on the vehicle when performing a lateral runout check in order to obtain the most accurate reading of the total indicated runout (TIR)
under real breaking conditions. If equipment is not available to perform the check with the wheels installed, then remove the wheels leaving the caliper in
place.
NOTICE: Any time the brake rotor is separated from the wheel bearing flange, clean any rust or foreign material from the mating surfaces of the
wheel bearing flange and the rotor. Failure to do so can result in increased lateral runout of the rotor and brake pulsation.
1. Clean the surface of the rotor.
Important: If it is necessary to remove the wheel, then reinstall the wheel nuts to retain the rotor. Tighten the wheel nuts to the correct torque
specification. Refer to Wheel Removal (Single Wheels) or Wheel Removal (Dual Rear Wheels). Failure to properly tighten the wheel nuts may
cause pedal pulsation and/or front end vibration during brake applications.
2. Fasten a dial indicator to the steering knuckle so that the indicator button contacts the rotor surface about 13 mm (0.5 inch) from the outer edge.
3. Set the dial indicator to zero.
4. Turn the wheel one complete revolution and observe the runout indicated on the dial.
5. The total indicated runout (TIR) for front disc brake rotors must not exceed 0.08 mm (0.003 inch). The TIR for rear disc brakes and for C3500
HO Models must not exceed 0.25 mm (0.010 inch).
6. Refinish or replace any rotor which is not within the lateral runout specifications.
In some cases, indexing the rotor on the hub by one or two bolt positions away from the original position will reduce the lateral runout. If it is
impossible to correct the amount of lateral runout by indexing the rotor, then check the hub and bearing assembly for excessive lateral runout or
looseness. If the hub and the bearing assembly lateral runout exceeds 0.040 mm (0.0015 inch), then repair or replace the hub and the bearing
assembly.
NOTICE: Any time the brake rotor is separated from the wheel bearing flange, clean any rust or foreign material from the mating surfaces of the
wheel bearing flange and the rotor. Failure to do so can result in increased lateral runout of the rotor and brake pulsation.
