Ksport BKBM321-445CO DualComp Rear 4-Piston Big Brake Kit with 14 in. Drilled Rotors

The Ksport BKBM321-445CO DualComp Big Brake Kit is a complete, bolt-on rear brake upgrade engineered for serious performance driving. Designed with drifting and rally racing in mind, the DualComp system features a single 4-piston caliper that handles both the foot brake and handbrake independently — 2 pistons dedicated to each circuit — delivering precise, reliable stopping power on and off the track.

Unlike conventional big brake kits that require separate caliper assemblies, the DualComp's integrated dual-circuit design simplifies the setup while maximizing rear brake performance. The system is Formula Drift legal and compatible with 18-inch wheels and above.

Two-Piece Floating Rotor Technology:

• 356mm (14 in.) drilled two-piece floating rotor for fade-free performance
• Rotor outer ring expands and contracts independently from the center hat, significantly reducing heat-induced warping
• Center hat crafted from 6061-T6 aircraft-grade aluminum for reduced rotational mass and faster heat dissipation
• Rotors commonly weigh up to 50% less than OEM rotors of the same diameter

Caliper & Hardware Features:

• Single 4-piston caliper with fully independent foot brake and handbrake circuits
• CNC machined carbon steel caliper brackets for direct bolt-on fitment at the OEM caliper bracket location
• Polished titanium handbrake cylinder and lever included
• D.O.T. compliant stainless-steel braided brake lines included

What's Included:

• 4-piston DualComp caliper(s)
• 14 in. drilled two-piece floating brake disc(s)
• Performance brake pads
• Polished titanium handbrake cylinder and lever
• CNC machined caliper brackets
• Stainless-steel braided brake lines
• All required installation hardware

The Ksport DualComp Big Brake Kit is designed for minimal-tool installation with no vehicle modifications required in most applications, making it one of the most straightforward high-performance brake upgrades available for drift and rally builds.