Procomp Rear Big Brake Kit w/ 4-Piston Calipers

The Ksport BKMZ051-442CO Procomp Big Brake Kit is engineered to deliver substantial stopping power and resistance to brake fade, even under repeated heavy braking. This rear kit is designed as a sophisticated bolt-on upgrade, requiring minimal tools for most applications. Caliper design features a lightweight, one-piece differential bore construction, CNC machined from aircraft-quality billet aluminum. Each caliper weighs just over 5 lbs, minimizing unsprung weight. The opposed piston design promotes even pad wear and enhances caliper rigidity. Components include aluminum pistons, high-temperature seals, and stainless steel brake pad wear plates, while stainless steel brake lines ensure a firm pedal feel by resisting expansion under pressure. The 2-piece floating rotor design contributes to reduced rotating and unsprung weight. This construction isolates thermal stress, preventing rotor warping and surface cupping. Rotors are heat-treated and balanced for longevity and performance. The cross-drilled surface type aids in cooling and is recommended for street and daily drivers, while slotted rotors (not included with this specific part number but available) are for track use. The kit includes caliper slides and mounting brackets.