REMOVAL & INSTALLATION
- Raise and safely support the vehicle.
- Remove the wheel and tire assembly.
- Disconnect the ABS speed sensor from the knuckle, if equipped.
- Remove the brake pads and the caliper.
- Check the disc run-out at this point. Make a note of the results for use during installation. Refer to the inspection procedure.
- Remove the grease cap from the hub. Remove the cotter pin and the castellated nut.
- Remove the wheel hub with the brake rotor attached.
- Perform the rotor inspection procedure.
- Coat the hub oil seal lip with multi-purpose grease and install the disc/hub assembly.
- Adjust the wheel bearings.
- Using a dial indicator, measure the disc run-out. Check it against the specifications in the Brake Specifications chart and the figures noted earlier.
If the wheel bearing nut is improperly tightened, disc run-out will be affected.
- Install the remainder of the components as outlined in the appropriate sections.
- Bleed the brake system.
- Road test the truck.
Examine the disc. If it is worn, warped or scored, it must be replaced. Check the thickness of the rotor against the specifications given in the Brake Specifications chart. If below specifications, replace it. Use a micrometer to measure the thickness. Because the allowable wear from new thickness to minimum thickness is only approx. 0.078 in. (2mm), resurfacing the discs is not recommended.
The disc run-out should be measured before the rotor is removed and again, after the rotor is installed. Use a dial indicator mounted on a stand to determine run-out. If run-out exceeds the maximum specification, replace the disc. Maximum runout is as follows:
Be sure that the wheel bearing nut is properly tightened. If it is not, an inaccurate run-out reading may be obtained. If different run-out readings are obtained with the same disc, between removal and installation, this is probably the cause.