REMOVAL & INSTALLATION
See Figure 1
- Remove the hub cap and loosen the lug nuts.
- Raise the front of the vehicle and support it on jackstands.
- Remove the lug nuts, tire and wheel.
- Remove the axle hub grease cap.
- Remove the cotter pin, and then loosen the hub nut. When the nut is close to the end of the spindle, pull the drum and hub assembly toward you. If it does not slide off the brake shoes, loosen the brake shoe adjuster star wheels. Remove the spindle nut, brake drum and hub, the washer, and the wheel bearings.
Be careful not to get foreign matter in the wheel bearings. The heavy coating of grease will hold many particles. These will damage the bearings.
- Inspect the brake drum as outlined below.
- Installation is the reverse of the removal procedures. For instructions on preloading the front wheel bearings, see the appropriate section.
- Clean the drum with a rag and a little paint thinner.
- Inspect the drum for cracks, grooves, scoring and out-of-roundness.
- Light scoring may be removed with fine emery paper, Heavy scores or grooves will have to be removed by having the drum turned on a lathe. This can be done at many automotive machine shops and some service stations.
- Before cutting the drum it must be measured to determine whether or not the inside dimension of the drum is within limitations after removing the score marks. The service limits of the brake drums are as follows:
- Check the drum for concentricity. An inside micrometer is necessary for an exact measurement, so unless this tool is available, the drum should be taken to a machine shop to be checked. Any drum which measures more than 0.15mm out of round will result in an inaccurate brake adjustment and other problems, and must be refinished or replaced.
Make all measurements at right angles to each other and at the open and closed edges of the drum machined surface.