REMOVAL & INSTALLATION
Servo Type With Single Anchor
- To aid in brake drum removal, loosen the brake adjusting star wheel.
- If the wheel is going to be removed from the drum, loosen the lug nuts at this time.
- Jack and support the vehicle.
- Insert a thin prytool into the adjusting hole after removing the plug. Push the adjusting lever away from the adjuster.
- Release the brake adjustment by prying down against the star wheel with a brake adjusting spoon.
- If you are removing the wheel from the drum, remove the lug nuts, then remove the wheel at this time.
- Remove the grease cap, cotter pin, lock, adjusting nut, and outer wheel bearing. Once the bearing is removed, you are free to pull the drum from the spindle.
- Install the drum. Reinstall the outer bearing.
- Insert the adjusting nut, a new cotter pin, and the grease cap.
- If removed from the drum, install the wheel.
- Adjust the wheel bearings and readjust the brakes.
- Remove the jackstands and lower the vehicle, then make sure the lug nuts are properly tightened.
- Raise and support the truck on jackstands.
- Remove the wheel and tire.
- Remove the dust cover, cotter key, nut, locknut, washer, and outer bearing.
- Carefully remove the drum.
- If there is interference between the brake shoes and drum, release the brake shoes by applying a brake adjusting spoon to the star wheel adjuster.
- Installation is the reverse of removal. Adjust the wheel bearings and then the brakes.
- Drum run out (out of round) and diameter should be measured. Each drum should be marked with its diameter. Drum diameter cannot exceed specification by more than 0.020 in. (0.5mm) and run out cannot exceed 0.006 in. Do not reface a drum more than 0.060 in. (1.5mm) over its standard diameter.
- Check the drum for large cracks and scores. Replace the drum if necessary.
- If the brake linings are wearing more on one edge than the other then the drum may be "bell'' shaped and will have to be replaced and resurfaced.