Cherokee 4WD L6-4.0L VIN S (1998)
Brake Drum: Service and Repair
BRAKE DRUM MACHINING
The brake drums can be machined on a drum lathe when necessary. Initial machining cuts should be limited to 0.12 - 0.20 mm (0.005 - 0.008
inch) at a time as heavier feed rates can produce taper and surface variation. Final finish cuts of 0.026 to 0.038 mm (0.001 to 0.0015 inch) are
recommended and will generally provide the best surface finish.
Be sure the drum is securely mounted in the lathe before machining operations. A damper strap should always be used around the drum to reduce
vibration and avoid chatter marks.
The maximum allowable diameter of the drum braking surface is stamped or cast into the drum outer edge. Always replace the drum if machining
would cause drum diameter to exceed the size limit indicated on the drum.
