REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Loosen the wheel lugs slightly, then raise and safely support the front of the car. Remove the wheel(s) and temporarily attach the rotor disc with two of the wheel nuts.
- Remove the two bolts from the torque plate.
- Remove the brake cylinder and suspend it with a piece of wire from the strut spring so that the brake hose in not under stress. DO NOT disconnect the brake hose.
- Remove the two anti-squeal springs, two brake pads, two anti-squeal shims, two wear indicator plates and four pad support plates. Note the various positions of the parts removed to make installation easier.
- Check the rotor thickness and disc runout as described in this Section.
- Install the four pad support plates and a new pad wear indicator plate on the inside brake pad.
Make sure that the arrow on the pad wear indicator is pointing in the rotating direction of the disc.
- Install the new brake pads onto the support plates, then install the two anti-squeal springs. Do not allow oil and grease to come in contact with the surface of the pads.
- Remove the master cylinder cap and take a small amount of brake fluid from the reservoir. Force the piston back into the caliper bore using a large C-type clamp to accommodate the greater thickness of the new brake pads. Always do one wheel at a time, because at this point there is the possibility of the opposite piston extending out of the caliper bore. If the piston is difficult to push into the caliper, loosen the bleeder plug and allow fluid to exit the caliper while depressing the piston into the caliper bore.
- Remove the supporting wire and position the brake cylinder carefully to avoid wedging the dust boot. Install the cylinder installation bolts. On 1983-86 vehicles, tighten the bolts to 18 ft. lbs. (24 Nm) and 29 ft. lbs. (39 Nm) on 1987-88 vehicles.
- Install the wheels and lower the vehicle.
- Check the master cylinder level to ensure that it is on the MAX line. Before moving the vehicle, make sure to pump the brake pedal to seat the pads against the rotors.
See Figures 4 thru 20
- Loosen the lug nuts slightly for the wheels.
- Raise and support the vehicle safely.
- Remove the wheels.
- On rear brake pads, remove the brake hose mounting bracket attached to the strut.
- Siphon a sufficient quantity of brake fluid from the master cylinder reservoir to prevent any brake fluid from overflowing the master cylinder when removing or installing new pads. This is necessary as the piston must be forced into the caliper bore to provide sufficient clearance when installing the pads.
- Grasp the caliper from behind and carefully pull it to seat the piston in its bore.
- On some models it will be necessary to remove the 2 caliper mounting pins (bolts), then remove the caliper assembly. Suspend the caliper with a wire. On other calipers, remove just the lower bolt and lift the caliper up and suspend it from a wire. Do not disconnect the brake line.
- Slide out the old brake pads along with any anti-squeal shims, springs, pad wear indicators and pad support plates. Make sure to note the position of all assorted pad hardware.
- Check the brake disc (rotor) for thickness and run-out. Inspect the caliper and piston assembly for breaks, cracks, fluid seepage or other damage. Overhaul or replace as necessary.
- Install the pad support plates into the torque plate.
- Install the pad wear indicators onto the pads. Be sure the arrow on the indicator plate is pointing in the direction of rotation.
- Install the anti-squeal shims on the outside of each pad and then install the pad assemblies into the torque plate.
- Position the caliper back down over the pads. If it won't fit, use a C-clamp or hammer handle and carefully force the piston into its bore.
- On front pads, install and tighten the caliper mounting bolts to 29 ft. lbs. (39 Nm) on 1989-91 vehicles, and 25 ft. lbs. (34 Nm) on 1992-96 models.
- On rear brake pads, install and tighten the caliper mounting bolt to 14 ft. lbs. (20 Nm).
- Attach the rear brake hose bracket and tighten the bolt to 21 ft. lbs. (29 Nm).
- Install the wheels and lower the vehicle. Check the brake fluid level. Before moving the vehicle, make sure to pump the brake pedal to seat the pads against the rotors.
If you hear a squealing noise coming from the brakes while driving, check the brake lining thickness and pad wear indicator by looking into the inspection hole on the brake cylinder with the wheels removed and the vehicle properly supported. The wear indicator is designed to emit the squealing noise when the brake pad wears down to 2.5mm at which time the pad wear plate and the rotor disc rub against each other. If there are traces of the pad wear indicator contacting the rotor disc, the brake pads should be replaced.
To inspect the brake lining thickness, look through the inspection hole and measure the lining thickness using a machinists rule. Also looks for signs of uneven wear. Standard thickness is 10mm. The minimum allowable thickness is 0.039 inch. (1mm) at which time the brake pads must be replaced.
Always replace the pads on both wheels. When inspecting or replacing the brake pads, check the surface of the disc rotors for scoring, wear and runout. The rotors should be resurfaced if badly scored or replaced if badly worn.