Rear Drum Brakes: Installation
NOTE:
When replacing rear brake shoes, inspect backing plate for excessive wear at 6 raised shoe contact pads. Excessive wear at raised shoe contact pads, such as notches or deep groves, could impede shoe travel. Never replace brake pads on one side of axle only. Left and right side brake pads must be replaced only as axle sets.
- Lubricate adjuster lever surfaces that rub on brake shoe web and backing plate at all 6 raised shoe contract pads.
- Install parking brake cable to parking brake lever of trailing (rear) brake shoe.
- Install trailing (rear) brake shoe to backing plate using hold down pin and retaining spring.
- Attach lower retaining spring and install leading (front) brake shoe, hold down pin, and retaining spring.
- Slightly pull apart brake shoes and install adjuster unit.
- Install adjuster lever with spring.
- Install retaining bracket and upper return spring.
- Using a 6.5-14.5" (165-368 mm) caliper such as Brake Shoe Setting Gauge (J21177-A), measure inside diameter of brake drum.
- Measure outside diameter of brake shoes and adjust brake adjuster to obtain .020" (0.5 mm) less than the reading obtained in previous step.
- Install brake drum and retaining screw. Tighten to specification. See TORQUE SPECIFICATIONS
- Bleed brakes if new wheel cylinder or backing plate was installed.
- Install wheel and lower vehicle from hoist.
- Apply and release brake pedal 20 times to allow adjuster to position brake shoes.
- Adjust parking brake cable. See PARKING BRAKE under ADJUSTMENTS.