Non-Servo Brakes

Exploded View Of Drum Brake Assembly.:

Removal
1. Raise and support rear of vehicle, then remove tire and wheel assembly.
2. Mark relationship of brake drum to axle for installation reference, then remove the drum. If drum is difficult to remove, proceed as follows:
a. Ensure parking brake is fully released, then back off parking brake cable adjustment.
b. Remove plug from access hole in backing plate, then push parking brake lever off its stop using a suitable screwdriver.
3. Lift actuator lever arm up until upper end clears slot in adjuster screw, then slide actuator off pin and disconnect actuator spring from shoe, Fig. 4.
4. Remove hold-down springs and pins.
5. Separate lower ends of shoes, then lift lower return spring over anchor plate. Allow ends of shoes to come together, then remove lower return spring.
6. Remove shoe and lining assemblies together with upper return spring and adjusting screw assembly. If necessary, overlap lower ends of shoes so upper shoe ends clear wheel cylinder boots, then spread bottom of assembly to clear axle flange.
7. Remove upper return spring and adjusting screw assembly from brake shoes.
8. Remove retaining ring, pin, spring washer and parking brake lever.
9. Remove parking brake lever from shoe.

Fig. 2 Measuring Brake Drum Inside Diameter:

Fig. 3 Adjusting Brake Shoes To Brake Drum Inside Diameter:

Installation
1. Install parking brake lever to shoe with spring washer, pin and retaining ring. Ensure concave side of washer faces parking brake lever, Fig. 4.
2. Install adjuster pin into shoe. Pin must project 0.268-0.276 inch from side of shoe where adjuster actuator is installed.
3. Apply suitable lubricant to threads of adjuster screw, inside diameter of socket and socket face.
4. Position brake shoes on a clean, flat surface, then install upper return spring to shoes. The spring must not be stretched to a length exceeding 8.04 inches.
5. Install adjusting screw assembly between shoes. Ensure screw properly engages adjuster shoe and parking brake lever. The spring clip must be installed toward the backing plate.
6. Apply a thin coat of white lithium grease or equivalent to shoe pads.
7. Install shoe and lining assemblies, upper return spring and adjusting screw assembly over axle and behind axle flange, then into backing plate, noting the following:
a. Use care to avoid damaging wheel cylinder boots.
b. Overlap lower portion of shoes to enable upper ends of shoes to clear boots on wheel cylinder.
c. Ensure upper ends of shoes are resting on ends of wheel cylinder pistons.
d. Do not position lower ends of shoes under anchor plate until lower return spring is installed.
e. Do not stretch lower return spring to a length exceeding 4.22 inches.
8. Position ends of shoe and lining assemblies together over anchor plate, then hook lower return spring into shoe web holes.
9. Spread lower ends of shoe and lining assemblies until they clear anchor plate, then position shoes against backing plate and release them.
10. Engage spring in groove at bottom of anchor plate.
11. Install hold-down springs and spring assemblies.
12. Position adjuster actuator over end of adjuster pin, ensuring top leg properly engages notch in adjuster screw.
13. Install actuator spring, ensuring free end of actuator engages notch in adjuster nut. Do not stretch actuator spring to a length exceeding 3.27 inches.
14. Using suitable brake drum to shoe gauge, Fig. 2, measure brake drum inside diameter. Adjust brake shoes to dimension obtained on outside portion of gauge, Fig. 3.
15. Connect parking brake cable to brake lever.
16. Install brake drum, tire and wheel assembly.
17. If any hydraulic connections have been opened, bleed brake system.
18. Adjust parking brake. Refer to Parking Brake System / Parking Brake / Adjustments / Manual Parking Brakes. Adjustments
19. Inspect all hydraulic lines and connections for leakage and repair as necessary.
20. Check master cylinder fluid level and replenish as necessary.
21. Check brake pedal for proper feel and return.
22. Lower vehicle and road test. Do not severely apply brakes immediately after installation of new brake linings or permanent damage may occur to linings. Brakes must be applied moderately during first several hundred miles of operation to ensure proper burnishing of linings.