4-Piston Red Caliper w/ 304mm Slotted Rotor Big Brake Kit

Integrating advanced brake technology, this kit ensures continuous cooling of the brake pads and surface. Constructed with an extreme lightweight caliper machined from aircraft-quality billet, this ProComp 4-piston unit weighs just over 5lbs and features differential bore configuration. It comes equipped with aluminum pistons, high-temperature seals, and stainless steel brake pad wear plates. The opposed piston caliper design offers superior pad wear and increased caliper rigidity compared to OEM systems. Additionally, stainless steel braided brake lines are included to prevent expansion under pressure, ensuring consistent pedal feel. The kit includes a 2-piece floating disc assembly with a 304mm (12in) diameter and a slotted rotor style. The floating disc design minimizes rotating and unsprung weight, while also reducing thermal stresses that can lead to warping. The unique slot design on the rotor not only diminishes braking noise but also efficiently expels gas and pad debris. Rotors are heat-treated and balanced for optimal performance. Slotted rotors are recommended for vehicles used more for track applications than daily driving. This specific kit, part number BKBM020-423SO, is designed for the rear of 1992-1998 BMW 323i, 325i, and 328i models with E36 chassis.