Check that there are no cracks or chips in the braking surface. Excessive bluing indicates overheating and a replacement drum is needed. The drum can be machined to remove minor damage and to establish a rounded braking surface on a warped drum. Never exceed the maximum oversize of the drum when machining the braking surface. The maximum inside diameter is stamped on the rim of the drum.
REMOVAL & INSTALLATION
- Raise the vehicle until the tire clears the floor.
- Remove the wheel cover or hub cap and the wheel bearing dust cap. Remove the cotter pin, nut lock, nut and washer.
- Pull the brake drum out approximately 2 in. (51mm), then push it back into position. Remove the wheel bearing and pull off the brake drum and hub assembly. Back off on the brake adjustment if the brake drum will not slip over the brake shoes.
- If the hub and drum assembly are to be replaced, remove the protective coating from a new drum with carburetor degreaser. Install new bearings and a new grease seal. Pack the wheel bearings. If the original drum is being used, be sure that the hub is clean and lubricated adequately.
- Install the drum assembly, outer wheel bearing, washer, and adjusting nut.
- Adjust the wheel bearing, install the nut lock and cotter pin, and the grease cap.
- Install the wheel and hub cap. Adjust the brake shoes if they were backed off to remove the drum.
E-150 AND E-250 LIGHT DUTY MODELS
- Raise the vehicle so that the wheel to be worked on is clear of the floor and install jackstands under the vehicle.
- Remove the wheel. Remove the three retaining nuts (if equipped) and remove the brake drum. It may be necessary to back off the brake shoe adjustment in order to remove the brake drum. This is because the drum might be grooved or worn from being in service for an extended period of time.
- Before installing a new brake drum, be sure to remove any protective coating with carburetor degreaser.
- Install the brake drum in the reverse order of removal and adjust the brakes.
- Raise the vehicle and install jackstands.
- Remove the wheel. Loosen the rear brake shoe adjustment.
- Remove the rear axle retaining bolts and lockwashers, axle shaft, and gasket.
- Remove the wheel bearing locknut, lockwasher, and adjusting nut.
- Remove the hub and drum assembly from the axle.
- Remove the brake drum-to-hub retaining screws, bolts or bolts and nut. Remove the brake drum from the hub.
- Place the drum on the hub and attach it to the hub with the attaching nuts and bolts.
- Place the hub and drum assembly on the axle and start the adjusting nut.
- Adjust the wheel bearing nut and install the wheel bearing lockwasher and locknut.
- Install the axle shaft with a new gasket and install the axle retaining bolts and lockwashers.
- Install the wheel and adjust the brake shoes. Remove the jackstands and lower the vehicle.