ProX offers a complete line of brake caliper rebuild kits. These kits are assembled with high quality components all designed and manufactured to meet or exceed the Orig. Equipment parts. Each kit contains all the necessary components like rubber boots, seals, bleeder cap, brake pad retaining pins and copper washers to rebuild the brake caliper. ProX Brake Caliper Rebuild features:. Assembled with high quality components. Designed and manufactured to meet or exceed the Orig. Equipment parts. Wide range of MX models available from stock.