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 brake drum inside diameter and run-out can be measured using a brake drum micrometer. The drum should be measured every time a brake inspection is performed. Take the inside diameter readings at points 90° apart from each other on the drum to measure the run-out. The maximum inside diameter is stamped on the rim of the drum or on the inside above the lug nut stud holes and is also contained in the brake specifications chart at the end of this section.
Removal & Installation
- Raise and safely support the vehicle securely on jackstands.
- Remove the tire and wheel assembly.
- Remove the three retaining clips (if equipped), then remove the brake drum.
- Install the brake drum in the reverse order of removal, then adjust the brakes as outlined later in this section.