See Figures 1 and 2
Check the disc brake rotor for scoring, cracks or other damage. If rotor run-out is checked, this should be measured while the rotor is installed. Use a dial gauge to check rotor run-out.
- Raise and support the rear of the vehicle safely using jackstands.
- Remove the rear wheels.
- Visually inspect the rotor for cracks, excessive scoring or other damage. A light scoring of the surface is normal and should not be considered detrimental to brake operation.
Before attempting to check rotor run-out on all vehicles, the bearings must be in good condition and exhibit no excessive play.
Check the disc for excessive run-out using a dial indicator:
- Position and secure a dial indicator so that the button contacts the disc about 1 in. (25mm) from the outer edge. Set the dial indicator to zero.
- Rotate the disc one complete revolution. The lateral run-out reading should not exceed 0.005 in. (0.13mm). If the reading is excessive, recondition or replace the disc.
Check the disc minimum thickness and the disc parallelism (thickness variation):
- Use a micrometer to check the disc thickness at 4 locations around the disc. Make sure the measuring point is at the same distance from the edge at all locations.
- The thickness should be greater than the minimum specification (which is normally cast onto the disc) and should not vary more than 0.0005 in. (0.013mm). If the variations are excessive, recondition or replace the disc. A disc which is smaller than the discard dimension MUST be replaced for safety.
REMOVAL & INSTALLATION
See Figures 3, 4 and 5
When removing the rotor, make sure the hand brake is not engaged.
- Raise and support the rear of the vehicle safely on jackstands.
- Remove the wheel and tire assembly.
- Disconnect the parking brake cable from the caliper. Refer to the procedure in this section.
- Remove the brake caliper mounting bolts and carefully remove the caliper (along with the brake pads) from the rotor. Do not disconnect the brake line. Secure the caliper out of the way with the flexible line still connected.
- Remove the caliper bracket retainer bolts from the rear of the brake assembly.
- Slide the rotor off the wheel studs. If the rotor will not come off easily, use a soft-faced hammer and tap around the rotor. If the rotor will still not come off, remove the rubber cap from the rear of the brake assembly, and loosen the hand brake adjuster star wheel for the brake shoes.
- Slide the rotor over the wheel studs and secure in place.
- Install the caliper bracket, and tighten the retainer bolts to 37 ft. lbs. (50 Nm).
- Install the brake pads and caliper.
- Attach the parking brake cable to the caliper assembly.
- If equipped with Duo-Servo type rear brakes, adjust the brake shoes, then install the rubber cap at the rear of the brake assembly.
- Install the tire and wheel assembly.
- Remove the supports and carefully lower the vehicle.