Brake reliningBrake linings that are worn to within 1/32 inch (.79mm) of a rivet head or that have been contaminated with brake fluid, grease, or oil must be replaced (Figure 47-27). Failure to replace worn linings result in a scored drum. When it is necessary to replace brake shoes, they must also be replaced on the wheel on the opposite side of the vehicle. Inspect brake shoes for distortion, cracks, or looseness. If these conditions exist, the shoe must be discarded. Do not let brake fluid, oil, or grease touch the brake lining. If a brake lining kit is used to replace the lining, follow the instructions in the kit and install all the parts provided.The two general method of attaching the lining to the brake shoes are bonding and riveting. The bonded lining are fastened (glued) with a special adhesive to the shoe, clamped in place, then cured in an oven. Instead of using an adhesive, some linings are riveted to the shoe. Riveted linings allow for better heat transfer than bonded lining.