Jeep JK Wrangler Front Big Brake Kit w/ Vented Rotors & Dual Piston Calipers RT Off RoadRT Off Roads Big Brake Kit is the solution to the strain that oversized wheels and tires place on the braking system on any JK Wrangler. This Brake Kit features Calipers with a pair of 54mm pistons for increased clamping forces, resulting in increased piston area over the single piston calipers. The 13 inch vented Brake Rotors give the braking system greater leverage. The end result of the Big Brake Kit when compared to OE brakes is a 22 percent