Genuine BMW Disc Brake Caliper Bracket Rear Right (M5 M6) - 34217849386 - Genuine BMW replacement part for M5 and M6 models. A disc brake caliper bracket is a metal frame that holds the caliper in place and helps to dissipate heat. It also helps to keep the caliper from moving too much, which can cause uneven brake pad wear. This bracket is made of high quality materials to provide a long lasting and reliable performance.