REMOVAL & INSTALLATION
- Remove the brake pads and the caliper, as detailed in the appropriate section.
- Check the disc run-out, as detailed following, at this point. Make a note of the results for use during installation.
- Loosen the parking brake shoes by rotating the star wheel upward.
- Remove the two mounting bolts and then remove the brake disc assembly.
- Perform the disc inspection procedure, as outlined in the following section.
- Install the disc/hub assembly and tighten the mounting bolts.
- Measure the disc run-out. Check it against the specifications 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 remainder of the components as outlined in the appropriate sections.
- Bleed the brake system.
- Road test the truck. Check the wheel bearing preload.
Examine the disc. If it is worn, warped or scored, it must be replaced. Check the thickness of the disc against the specifications given in the "Brake Specifications" chart. If it is below specifications, replace it. Use a micrometer to measure the thickness.
The 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.
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.