REMOVAL & INSTALLATION
Single Piston Floating Caliper Disc Brakes
See Figures 1 through 11
- Remove approximately 2 / 3 of the fluid from the rear reservoir of the tandem master cylinder. Raise and support the vehicle, taking proper safety precautions.
- Remove the wheel and tire assembly.
- Remove the key retaining screw from the caliper retaining key.
- Slide the retaining key and support spring either inward or outward from the anchor plate. To remove the key and spring, a hammer and drift may be used, taking care not to damage the key in the process.
- Lift the caliper assembly away from the anchor plate by pushing the caliper downward against the anchor plate and rotating the upper end upward out of the anchor plate. Be careful not to stretch or twist the flexible brake hose.
- Remove the inner shoe and lining assembly from the anchor plate. The inner shoe anti-rattle clip may become displaced at this time and should be repositioned on the anchor plate. Lightly tap on the outer shoe and lining assembly to free it from the caliper.
- Clean the caliper, anchor plate, and disc assemblies, and inspect them for brake fluid leakage, excessive wear or signs of damage. Replace the pads if either of them are worn to within 1 / 4 in. (0.8mm) of the rivet heads.
- To install new pads, use a 4 in. (10cm) C-clamp and a block of wood 1 in. (25mm) and approximately 3 / 4 in. (19mm) thick to seat the caliper hydraulic piston in its bore. This must be done in order to provide clearance for the caliper to fit over the rotor when new linings are installed.
- At this point, the anti-rattle clip should be in its place on the lower inner brake shoe support of the anchor plate with the pigtail of the clip toward the inside of the anchor plate. Position the inner brake shoe and lining assembly on the anchor plate with the pad toward the disc.
- Install the outer brake shoe with the lower flange ends against the caliper leg abutments and the brake shoe upper flanges over the shoulders on the caliper legs. The shoe is installed correctly when its flanges fit snugly against the machined surfaces of the shoulders.
- Remove the C-clamps used to seat the caliper piston in its bore. The piston will remain seated.
- Position the caliper housing lower V-groove on the anchor place lower abutment surface.
- Pivot the caliper housing upward toward the disc until the outer edge of the piston dust boot is about 1 / 4 in. (6mm) from the upper edge of the inboard pad.
- In order to prevent pinching of the dust boot between the piston and the inboard pad during installation of the caliper, place a clean piece of thin cardboard between the inboard pad and the lower half of the piston dust boot.
- Rotate the caliper housing toward the disc until a slight resistance is felt. At this point, pull the cardboard downward toward the disc centerline while rotating the caliper over the disc. Then remove the cardboard and complete the rotation of the caliper down over the disc
- Slide the caliper up against the upper abutment surfaces of the anchor plate and center the caliper over the lower anchor plate abutment.
- Position the caliper support spring and key in the key slot and slide them into the opening between the lower end of the caliper and the lower anchor plate abutment until the key semicircular slot is centered over the retaining screw threaded hole in the anchor plate.
- Install the key retaining screw and tighten to 12-16 ft. lbs. (16-22 Nm).
- Check the fluid level in the master cylinder and fill as necessary. Install the reservoir cover. Depress the brake pedal several times to properly seat the caliper and pads. Check for leakage around the caliper and pads. Check for leakage around the caliper and flexible brake hose.
- Install the wheel and tire assembly and tighten the nuts to 70-115 ft. lbs. (94-154 Nm). Install the wheel cover.
- Adjust the rear brakes and lower the car. Make sure that you obtain a firm brake pedal and then road test the car for proper brake operation.
Sliding Caliper Disc Brakes1980-85 Models
See Figures 12 through 18
- Raise the vehicle, and safely support with jackstands. Remove the front wheels.
- Remove the lockwires from the two mounting bolts. Remove the mounting bolts and lift the caliper away from the disc. Support the caliper with a coat hanger or other piece of wire.
- Remove the retaining clips with a suitable prytool and slide the outboard pad and retaining pins out of the caliper. Remove the inboard pad.
- Use a C-clamp or other suitable tool to compress the caliper piston back into the caliper bore.
- Slide the new inboard pad into the caliper so that the tabs are between the retaining clips and anchor plate and the backing plate lies flush against the piston.
- Insert the inboard pad retaining pins into the outboard pad and position them in the caliper.
Stabilizer, insulator, pad clips, and pins should always be replaced when the disc pads are replaced.
- Hold the retaining pins in place (one at a time) with a short drift pin or dowel and install the retaining clips.
- Slide the caliper assembly over the disc and align the mounting bolt holes.
- Install the lower bolt finger-tight. Install the upper bolt and tighten. Secure the lower bolt. Safety-wire both bolts. The torque specifications are: Upper anchor plate mounting bolt 125 ft. lbs. (169 Nm) and lower anchor plate mounting bolt 105 ft. lbs. (142 Nm). The caliper mounting bolts 25-6 ft. lbs. (5-47 Nm).
Do not deviate from this procedure. The alignment of the anchor plate depends on the proper sequence of bolt installation.
- Check the brake fluid level and pump and brake pedal to seat the lining against the disc. Adjust the rear brakes if necessary. Replace the wheels and road-test the vehicle.
- Raise the vehicle until the wheel and tire clear the floor. Place safety stands under the vehicle.
- Remove the wheel cover.
- Remove the wheel and tire from the hub and disc.
- Remove the brake pads as described above and visually inspect the shoe and lining assemblies. If the lining material has worn to a thickness of 0.125 in. (3.175mm) or less, or if the lining is contaminated with brake fluid, replace all pad assemblies on both front wheels. Make all thickness measurements across the thinnest section of the pad assembly. A slight taper on a used lining should be considered normal.
- Reinstall or replace the brake pads and caliper assemblies, as described above.
When installing new brake linings, replace the pads at both front wheels to avoid uneven braking.
- Refill the master cylinder, if necessary.
- Install the wheel and tire assembly and tighten the wheel lug nuts.
- Install the wheel cover and lower the vehicle.