See Figure 1
The inner brake pads are equipped with metal wear indicators which act as warning devices to alert the driver to change the brake pads.
When the brake pad wears to the minimum service limit, the indicator contacts the rotor and makes a noticeable "chirping" noise while the wheels are turning. When you here this sound, it's time to replace the front pads.
To perform a visual inspection, do the following:
- Loosen the rear lug nuts.
- Raise the rear end and support safely.
- Remove the rear wheels.
- Check the brake lining thickness through the inspection window in the caliper with a six inch machinist's rule. Minimum pad thickness is 0.8mm. After checking the brake lining thickness, check the brake pads for oil deposits, and check the pad springs for wear and damage. Make replacements as necessary.
- Check the leading and trailing shoe keys and retaining screw for damage. If these components are damaged, replace them at the same time as the pads.
- Check for worn or damaged dust boots. If mud or dirt has penetrated the piston seal, the caliper must be re-built or replaced.
- Mount the rear wheels, tighten the lug nuts and lower the vehicle.
REMOVAL & INSTALLATION
See Figures 2, 3, 4, 5 and 6
- Raise the vehicle and support it safely.
- Remove the tire and wheel assemblies.
- Remove the screw which holds the trailing shoe key onto the anchor plate. Bias the caliper assembly against the thin key and slide the trailing shoe outward.
- Remove both caliper support pins which holds the caliper to the anchor plate. While biasing the caliper assembly against the leading shoe key, swing the front end of the caliper up and past the anchor plate rail. The caliper should be free. Support the caliper using wire making sure not to twist the brake fluid hose during removal.
- To remove the outer shoe, push the outer shoe inward off of the caliper legs. The locator buttons must clear the slots in the housing before the shoe can be removed. Remove the inner shoe by pulling the shoe outward until the shoe clears the piston.
- Remove the cap from the master cylinder reservoir and, using a clean suction gun, remove about 6mm of fluid. Using a large C-clamp, press the piston all the way back into the caliper.
- Install the new pads and clips. Position the pad with the wear sensor on the piston side and upwards.
- Position the caliper and install the bolts. Torque the bolts to 25 ft. lbs. (34 Nm).
- Refill the master cylinder, install the tire and wheel assemblies and pump the brake pedal until firm.