Brake shoes on rear drum brakes
1 – brake shoe support stand; 2 – brake shield; 3 – working brake cylinder; 4 – lever latch; 5 – expansion bar; 6 – parking brake lever; 7 – upper return spring; 8 – rear brake shoe; 9 – spring; 10 – clamp; 11 – brake drum; 12 – lower return spring; 13 – regulator spring; 14 – front brake shoe.
Removal
1. Remove the wheel and brake drum.
2. Remove the brake shoe support clamp, automatic adjuster spring and adjuster lever.
3. Press the pads and remove the pad adjuster.
4. Remove the brake pads together with the return springs.
Examination
1. Measure the inside diameter of the brake drum. Use a dial indicator to check the runout of the brake drum. Replace the brake drum if the inside diameter of the drum exceeds the maximum allowable value.
- Maximum diameter: 200 mm
- Brake drum runout: 0.015 mm
2. Measure the thickness of the rear brake pads. Replace all brake pads on one axle of the vehicle, even if only one pad is less than the maximum thickness.
Minimum thickness: 1.0 mm
3. Check the brake shoe linings for oil or grease contamination, wear and cracks.
4. Inspect the wheel cylinders for brake fluid leaks.
5. Inspect the brake shield for wear or damage.
6. Check that the brake shoe fits evenly against the brake drum.
Installation
1. Apply grease to the following brake pad contact points:
- a. points of contact of brake pads with brake shield;
- b. points of contact of the brake pads with the backing plate.
Recommended lubricant: SAE J310, NLGI No.2
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2. Install the brake shoe support stand.
3. Install the return springs onto the brake shoes.
4. After installing the brake drum, tighten the parking brake lever several times.