Brothers 13" big brake front system uses a 13" cross-drilled, gas slotted and zinc washed rotor, mounted to a 2024 t6 billet aluminum cnc machined anodized hub and a c15 caliper that attaches to the modular drop spindle with custom caliper mounting brackets. C15 calipers have twin 52mm pistons and a larger brake pad surface area that offers about 60% more stopping power in the caliper than the popular c5 caliper at half the cost. Big brake kits requires a 17 diameter disc brake type wheels (easy-to-use wheel template available). Our big brake rear kit utilizes a 12 rotor and lincoln (e-brake style) caliper. Kits are complete and include front and rear rotors, front and rear loaded calipers, hoses, front bearings and seals, front and rear mounting brackets, forged aluminum hubs, rear hard lines, rear e-brake cables (or adaptors), all necessary hardware and include a 4-wheel disc master cylinder and proportioning valve kit. Note: kits are all original drum offset.