Rear Caliper Rebuild Kit. Weak brakes in need of a re-build? The All Balls Rear Caliper Rebuild Kit is here to help. This kit comes with everything you need to bring your rear caliper back into spec, even including the pins to replace your old grooved-out ones, as well as copper washers for when you remove your caliper from the brake line. Each kit contains all rubber parts necessary to rebuild one caliper. Kit includes: Boots, seals, bleeder cap, brake pad retaining pins, and copper washers (actual contents listed when available). Note: Kit contents will vary by fitment and are subject to change. Kit Includes: 1 bolt kit(s). 4 boot(s). 6 caliper seal(s). 3 O-ring(s). 2 washer(s).