Brake Drum: Service and Repair

REMOVE
If the vehicle has high mileage, the brake drums may have a ridge worn in them by the brake shoes. This ridge causes the brake drum to interfere with the brake shoes thus, not allowing the brake drum to be removed. Further clearance can be obtained by backing off the brake's automatic self adjuster mechanism, using the following procedure.
1. Remove the rubber plug from the brake support plate.
2. Insert a screwdriver, through the automatic adjuster access hole, in the rear brake support plate. Engage screwdriver with the teeth on the adjuster mechanism quadrant. Then rotate quadrant so that the teeth on the quadrant are moved toward the front of the vehicle. This will back off the adjustment of the rear brake shoes.
3. Remove rear brake drum from the rear hub and bearing assembly.





Measure drum runout and diameter. If not to specification, reface drum. (Runout should not exceed 0.1524 mm or 0.006 inch). The diameter variation (oval shape) of the drum braking surface must not exceed either 0.0635 mm (0.0025 inch) in 30° or 0.0889 mm (0.0035 inch) in 360°. All brake drums are marked with the maximum allowable brake drum diameter.


INSTALL
1. Install rear brake drum on rear hub and bearing assembly.
2. Install the wheel and tire assembly.
3. Tighten the wheel mounting stud nuts in proper sequence until all nuts are torqued to half specification. Then repeat the tightening sequence to the full specified torque of 115 - 155 Nm (85 - 115 ft. lbs.).
4. Adjust rear brakes. The rear brakes on this vehicle are adjusted by depressing the brake pedal as far as possible 2 or 3 times.