REMOVAL & INSTALLATION
See Figures 1 through 6
We recommend replacement of the brake rotor in axle sets for added safety and reliability.
- Raise the front of the truck and safely support it with jackstands.
- Remove the lug nuts and the wheel.
- Remove the brake pads, caliper and torque member, as detailed earlier in this section.
- Check the disc run-out.
- Remove the grease cap from the hub. Remove the cotter pin and the castellated nut.
- Remove the wheel hub with the brake disc attached.
- Perform the disc inspection procedure, as outlined later in this section.
- Coat the hub oil seal lip with multipurpose grease and install the disc/hub assembly.
- Check and adjust the wheel bearing preload, as described in General Information & Maintenance (2wd) or Chapter 8 (4wd).
- Measure the disc run-out. Check it against the figures in the Brake Specifications chart and against the figures noted during removal.
If the wheel bearing nut is improperly tightened, disc run-out will be affected.
- Install the castellated nut with a new cotter pin, then install the grease cap.
- Install the torque member, caliper and brake pads.
- Bleed the brake system.
- Lower the vehicle, then road test the truck.
Examine the disc. If it is worn, warped or scored, it must be replaced. Check the thickness of the disc against the figures given in the Brake Specifications chart. If it is below specifications, replace it. Use a micrometer to measure the thickness.
Disc run-out should be measured before the disc is removed and again, after the disc is installed. Use a dial indicator mounted on a stand to determine run-out. If run-out exceeds 0.0028 in. (0.07mm), replace the disc.
Be sure that the wheel bearing nut is properly tightened. If it is not, an inaccurate run-out reading may be obtained. If a different run-out reading is obtained after installation of the same disc, an improperly tightened wheel bearing nut may be the cause.
For wheel bearing removal, installation and adjustment, please refer to General Information & Maintenance or Chapter 8 .