These vehicles utilize two types of park brake systems which operate the rear brakes in different fashions.
The parking brake pedal on model year 2000 and later moves a lever to mechanically force the rear brake pad tightly against the brake rotor. Parking brake application is completely independent of the hydraulic brake system. Brake shoe service takes place when the rear disc brake pads are replaced.
Model year 1999 Eldorado and Deville, and models equipped with J55 Heavy Duty Brake Systems (commercial) utilize a small drum brake located within the rear disc brake rotor which is mechanically operated when the parking brake pedal is depressed. The parking brake shoe should be inspected during routine brake maintenance.
- Set the gauge to the inside diameter of the rear brake rotor.
- Position the gauge over the park brake shoe at its widest point.
Turn the adjuster nut until the lining just contacts the gauge.
- Repeat the previous steps for the opposite side.
- The clearance between the park brake shoe and the rotor is 0.660 mm (0.026 inches).
Removal & Installation
- Raise and support the vehicle.
- Remove the tire and the wheel.
- Pull down on the front park brake cable and remove the front park brake cable from the connector.
- Remove the park brake cable from the brake caliper lever.
- Remove the rear brake caliper.
- Remove the rear brake caliper bracket.
- Remove the brake rotor.
- Turn the adjustment screw to the fully home position with the notched adjustment nut.
Remove the park brake shoe assembly by sliding the shoe towards the retaining spring until the shoe disengages from the spring.
- Clean the debris and the dust from the park brake components using a clean shop towel.
- Align the slots in both the adjusting screw and tappet to be parallel with the backing plate face.
- Position the park brake shoe on the inboard side of the actuator.
- Slide the parking brake shoe into position and seat into the retaining spring.
- Inspect the shoe assembly position. The shoe must be central on the backing plate with both tips located in the slots.
- Adjust the park brake shoe.
- Install the brake rotor.
- Install the rear brake caliper bracket.
- Install the rear brake caliper.
- Install the park brake cable to the park brake lever.
- Connect the front park brake cable to the connector.
- Install the tire and wheel..
- Lower the vehicle.