Ksport BKBM300-445CO DualComp Rear 4-Piston Big Brake Kit with 14 in. Drilled Rotors

The Ksport BKBM300-445CO DualComp Big Brake Kit is a complete rear brake upgrade engineered for high-performance street and motorsport use. Designed with drifting and rally racing in mind, the DualComp system integrates foot brake and handbrake functionality into a single, compact 4-piston caliper — eliminating the need for a separate handbrake caliper entirely.

The innovative dual-circuit design splits the caliper's four pistons into two independent systems: 2 pistons dedicated to the foot brake and 2 pistons dedicated to the hydraulic handbrake. Each circuit operates independently on its own hydraulic system, delivering precise and consistent brake force whether you're trail-braking into a corner or initiating a drift entry.

Key Features:

• 4-Piston DualComp Caliper — integrated foot brake and handbrake in a single caliper unit
• Two-Piece Floating Rotor Design — up to 50% lighter than OEM rotors of equivalent size
• 6061-T6 Aircraft-Grade Aluminum Hat — reduces rotational mass for faster, more responsive braking
• Cross-Drilled Rotor — promotes cooler running temperatures, ideal for street and daily-driven performance vehicles
• CNC Machined Carbon Steel Caliper Brackets — precision-fit for a bolt-on installation
• Polished Titanium Handbrake Hardware Included
• SC1 Street Brake Pads Included
• Stainless Steel Brake Lines Included
• Complete Bolt-On Kit — includes calipers, floating brake disc, brake pads, handbrake hardware, and all required mounting hardware
• Formula Drift Legal — competition-tested and approved
• 12-Month Warranty against manufacturer defects

Rotor Specifications:

• Rotor Diameter: 356 mm / 14 in.
• Rotor Style: Cross-Drilled
• Rotor Type: Two-Piece Floating
• Caliper Position: Rear

The two-piece floating rotor construction allows the outer ring to expand and contract independently from the aluminum center hat, dramatically reducing the risk of warping under high heat loads. The aluminum center section also acts as a heat sink, drawing thermal energy away from the rotor face and dissipating it through the hub assembly — keeping brake response consistent lap after lap. Installation requires minimal tools and no permanent vehicle modifications in most applications. This kit is built to order by Ksport.