Ksport BKAU122-435CO DualComp Rear 4-Piston Big Brake Kit with 13 in. Drilled Rotors

The Ksport DualComp Big Brake Kit is a complete, bolt-on rear brake upgrade engineered for high-performance driving. Designed with drifting and rally racing in mind, the system features a single 4-piston caliper that cleverly splits its function — two pistons dedicated to the foot brake and two pistons dedicated to the handbrake — with each circuit operating fully independent from the other on its own hydraulic system.

The included two-piece floating brake disc features a lightweight center section crafted from 6061-T6 aircraft-grade aluminum, delivering significantly lower rotational mass compared to traditional one-piece OEM rotors. The outer ring can expand and contract independently from the center hub, dramatically reducing the risk of rotor warping under sustained heat load. The aluminum center section also acts as an effective heat sink, channeling heat away from the rotor and into the surrounding air and hub assembly.

Key Features:

• Dual-function 4-piston caliper — 2 pistons for foot brake, 2 pistons for handbrake, each on independent hydraulic circuits
• Rotor diameter: 330 mm (13 in.) — drilled rotor style
• Two-piece floating rotor design with 6061-T6 aircraft-grade aluminum center hat
• Rotors commonly up to 50% lighter than OEM rotors of the same size
• Polished titanium handbrake cylinder and lever included
• CNC-machined carbon steel caliper brackets for direct bolt-on fitment to OEM bracket location
• DOT-compliant stainless-steel braided brake lines included
• Formula Drift legal
• For 2WD vehicles only

This kit ships complete with everything required for installation: calipers, floating brake disc, brake pads, handbrake hardware, caliper brackets, braided brake lines, and all necessary mounting hardware. Minimal tools are required and no permanent vehicle modifications are needed in most applications.