The KC3090-36 is a rear-axle Z36 Truck & Tow package for the Jeep Wrangler JK, combining drilled and slotted rotors, carbon-fiber ceramic pads, and red powder-coated calipers in one bolt-on set. The manufacturer recommends the kit for towing, hauling, larger tire and wheel upgrades, and hilly terrain. Its rotors are cast from G3000 iron to strict OE tolerances, so the set fits without modification. Owners on user forums describe a clear improvement over factory brakes, especially on heavier or lifted Wranglers, though the gain is more modest on stock-weight vehicles.
The main reason to choose this over a pads-and-rotors-only set is the caliper package. The kit includes four red powder-coated calipers, and the manufacturer notes that the coating resists corrosion. Forum members point out that the rotor-and-pad version lets you keep healthy factory calipers, which lowers the price if your stock units are in good shape. Reviews are mixed: one forum thread reports rear pads wearing out at roughly 10,000 miles on a heavy two-door JK, while others praise quiet, low-dust braking. Details vary, so confirm with the manufacturer before buying. Searchers looking for a 2007-2017 Wrangler JK rear Z36 brake upgrade with red calipers will find this is the complete rear option.
The manufacturer's install materials cover 2007-2017 Wrangler JK and JKU models. Listings from different sources disagree about 2018 coverage, so confirm your model year with the manufacturer before ordering.
No. The calipers come in this kit, but user forums note that the rotor-and-pad version (K3090-36) lets you keep your factory calipers. Choose this kit if you want the red powder-coated calipers.
The manufacturer's install guidance lists brake bleeding and a break-in procedure as steps after installation. Follow the break-in process to bed in the new pads and rotors properly.
The manufacturer's install video covers replacing the rotors and pads on a 2012-2013 JKU, and it notes that wrench sizes, part designs, and torque specs can differ from one vehicle to another, so check your service manual. Owners on user forums say the rear rotors can be stubborn to remove. One tip is to loosen the parking-brake shoes through the rubber flapper on the back of the rotor, and one owner reports the rotors slid right off after doing this. Plan for a full brake job with the calipers swapped, and have a torque wrench, jack stands, and brake fluid ready for bleeding.
