The TeraFlex Delta Front Brake Kit is the ultimate upgrade for JL and JK Wrangler/Unlimited and JT Gladiator models with oversized and heavier wheels/tire combos requiring increased braking performance. A must for 33-42” tires or heavy-laden overland rigs. Includes all the components required to upgrade the front axle. Fits: JL Wrangler (2-door) JL Wrangler Unlimited (4-door) JK Wrangler (2-door) JT Gladiator (pickup) JK Wrangler Unlimited (4-door) Minimum Wheel Diameter: 17” Back Spacing: 4. 75” or less MUST VERIFY FITMENT W/ DOWNLOADABLE TEMPLATE Significantly improved braking performance over factory brake system MODEL NO - 4403451