Remove the drum and inspect the lining thickness of both brake shoes. The rear brake shoes should be replaced if the lining is less than 1 / 16 in. (1.5mm) at the lowest point (bonded linings) or above the rivet heads (riveted linings) on the brake shoe. However, these lining thickness measurements may disagree with your state inspections laws.
Brake shoes should always be replaced in sets.
REMOVAL & INSTALLATION
See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14
The following procedure requires the use of the GM Brake Spring Pliers tool No. J-8057 or equivalent.
- Raise and support the rear of the vehicle on jackstands.
- Slacken the parking brake cable.
- Remove the rear wheels and the brake drum.
- Using the GM Brake Spring Pliers tool No. J-8057 or equivalent, disconnect the brake shoe return springs, the actuator pullback spring, the hold-down pins/springs and the actuator assembly.
Special brake spring tools are available from the auto supply stores, which will ease the replacement of the spring and anchor pin, but the job may still be performed with common hand tools.
- Disconnect the adjusting mechanism and spring, then remove the primary shoe. The primary shoe has a shorter lining than the secondary and is mounted at the front of the wheel.
- Disconnect the parking brake lever from the secondary shoe and remove the shoe.
- Clean and inspect all of the brake parts.
- Check the wheel cylinders for seal condition and leaking.
- If necessary, repack the wheel bearings and replace the oil seals.
- Inspect the replacement shoes for nicks or burrs, lubricate the backing plate contact points, the brake cable, the levers and adjusting screws, then reassemble them.
- Make sure that the right and left hand adjusting screws are not mixed. You can prevent this by working on one side at a time. This will also provide you with a reference for reassembly. The star wheel should be nearest to the secondary shoe when correctly installed.
- Using lithium grease or equivalent, lubricate the shoe pads (on the backing plate) and the adjusting screw threads.
- Install the springs and adjusters. When completed, make an initial adjustment as previously described.