The TeraFlex front JK Big Brake Kit is designed as a factory brake upgrade for JK owners looking for a performance brake package that will handle the increased braking requirements needed after larger wheels and tires are used. We recommend using this kit on any JK with 37" tires or larger. This front JK Big Brake kit includes: (2) Dual-piston brake calipers provide more clamping force than factory calipers, with an increased surface area. The larger calipers provide a more efficient method of heat dissipation for decreased brake fade. Your choice of either: (2) High-performance 13.3" slotted/vented rotors aid in keeping the braking system cool for maximum stopping power even in the most extreme conditions. A premium e-coat finish is durable and resists rust. Or (2) High-performance 13.3" smooth rotors for excellent stopping power. (4) High performance brake pads that provide greater surface area and reduce brake dust and noise during extreme braking. The composite-resin, semi-metallic pads increase the lifetime of the brake system. ***Minimum Wheel size is 17" Diameter***