Parking Brake Shoe: Service and Repair

Fig. 3 Exploded View Of Rear Disc Brake Parking Brake Assembly. 93-94 Supra, Celica:

Fig. 4 Exploded View:

DISASSEMBLY OF PARKING BRAKE



- Remove rear disc brake assembly
- Remove the axle carrier mounting bolt and nut of upper side.
- Remove the two mounting bolts and remove the disc brake assembly.
- Suspend the disc brake so the hose is not stretched.
- Remove rotor disc




NOTE: If the rotor disc cannot be removed easily, return the shoe adjuster until the wheel turns freely.

- Remove shoe return springs [Two Wheel Drive (2wd) without Anti-Lock Brakes (ABS) and Four Wheel Drive (4wd)]



- Using Special Service Tool (SST), remove the shoe return springs. SST 09717-20010
- Remove shoe return springs [2WD with ABS]



- Using needle-nose pliers, remove the shoe return spnngs.
- Remove front shoe, adjuster and tension spring



- Slide Out the front shoe and remove the shoe adjuster.
- Remove the shoe strut with spring.
- Disconnect the tension spring and remove the front shoe.



- Slide out the rear shoe.
- Remove the tension spring from the rear shoe.
- Disconnect the parking brake cable from the parking brake shoe lever.
- Remove the shoe hold-down spring cups, springs and pins.

INSPECTION AND REPAIR OF PARKING BRAKE COMPONENTS

- Inspect the disassembled parts for wear, rust or damage.



- Measure brake shoe lining thickness

Standard thickness: 2.0 mm (0.079 in.)
Minimum thickness: 1.0 mm (0.039 in.)

- If the shoe lining is less than minimum or shows signs of uneven wear, replace the parking brake shoes.



- Measure brake disc inside diameter

Standard inside diameter: 170 mm (6.69 in.)
Maximum inside diameter: 171 mm (6.73 in.)

NOTE:If the disc is scored or worn, the brake disc may be lathed to the maximum inside diameter.




- Inspect parking brake lining and disc for proper contact



- Measure clearance between parking brake shoe and lever
- Using a feeler gauge, measure the clearance. Standard clearance: Less than 0.35 mm (0.0138 in) If the clearance is not within specification, replace the shim with one of the correct size.



- Remove the parking brake lever, and install the correct size shim. If necessary, replace shim.





- Install the parking brake lever with a new C-washer.
- Remeasure the clearance.

REASSEMBLE PARKING BRAKE







- Apply high temperature grease to the sliding surfaces of the shoe.



- Apply high temperature grease to adjust as shown.



- Install the shoe hold-down springs, cups and pins.
- Connect the parking brake cable to the parking brake lever of the rear shoe.




- Slide in the rear shoe between the shoe hold-down spring cup and the backing plate.

CAUTION: Do not allow oil or grease to get on the friction surface.




- Install the tension spring to the rear shoe.
- Install the front shoe to the tension spring.
- Install the adjuster between the front and rear shoes.
- Install the shoe strut with spring.



- Slide in the front shoe between the shoe hold-down spring cup and the backing plate.
- Install shoe return springs [2WD (w/o A.B.S.) and 4WD]



- Using SST, install the front return spring and then install the rear return spring. (SST 09718-20010)
- Install shoe return springs [2WD (w/o A.B.S.)]



- Using needle-nose pliers, install the shoe return springs.




- Before installing, polish the disc and shoe surfaces with sandpaper.
- Align the hole on the rear axle shaft flange and service hole on the disc.




- Temporarily install the hub nuts.
- Remove the hole plug.
- Turn the adjuster and expand the shoes until the rotor disc locks.
- Return the adjuster eight notches.
- Install the hole plug.




- Install the disc brake assembly and torque the two mounting bolts.

Torque: 47 Nm (34 ft lb)

- Install the axle carrier bolt and nut of upper side.

Torque: 206 Nm (152 ft lb)

- Install rear wheel.

BEDDING DOWN PARKING BRAKE SHOES AND DISC

- Drive the vehicle at about 50 km/h (31 mph) on a safe, level and dry road.
- With the parking brake release button pushed in, pull on the lever with 88 N (19.8 lb) of force.
- Drive the vehicle for about 400 meters (0.25 mile) in this condition.
- Repeat this procedure two or three times.
- Recheck and adjust parking brake lever travel.