The unsurpassed braking capacity of the Forged Narow Superlite 4R four - piston caliper serves as the base of this 14 big rotor kit for these popular 2007 - up Jeep JK or Wrangler model vehicles. FNSL4 kits are engineered application specific for simplified installation and full compatibility with OE master cylinder output and ABS functions where used. Big brake kits provide increased brake capacity and complimentary style with wheel, tire, and suspension upgrades. Optional caliper finishes and rotor designs simplify personalizing the style and braking requirements of any application.