Ksport BKMZ300-445SO DualComp Rear Big Brake Kit 4-Piston 14 in. Slotted Rotors

The Ksport DualComp Big Brake Kit is a complete rear brake upgrade engineered for drivers who demand both track-proven stopping power and integrated handbrake functionality. This bolt-on system is designed with drifting and rally racing in mind, and is fully Formula Drift legal.

Dual-Function 4-Piston Caliper Design:

At the heart of the DualComp system is a single 4-piston caliper that serves two independent purposes: 2 pistons are dedicated to the foot brake circuit, while the remaining 2 pistons operate the handbrake — each running on its own fully independent hydraulic system. A polished titanium handbrake cylinder and lever are included, improving both feel and driver control.

Key Specifications:

• Caliper Type: 4-Piston (Dual-Function)
• Rotor Diameter: 356 mm / 14 inches
• Rotor Style: Slotted
• Position: Rear
• Rotor Construction: Two-piece floating design
• Center Bell Material: 6061-T6 aircraft-grade aluminum
• Caliper Brackets: CNC-machined carbon steel
• Brake Lines: D.O.T.-compliant stainless-steel braided
• Minimum Wheel Size: 18 inches

Lightweight Two-Piece Floating Rotors:

The DualComp system uses two-piece floating rotors that commonly weigh up to 50% less than OEM rotors of the same diameter. The aluminum center bell reduces rotational mass for sharper brake response, while the floating outer ring is free to expand and contract independently — dramatically reducing the risk of heat-induced warping. The aluminum center section also acts as a heat sink, drawing thermal energy away from the rotor and into the surrounding air and hub assembly.

Stainless-Steel Braided Brake Lines:

D.O.T.-compliant stainless-steel braided brake lines are included as standard equipment. Unlike rubber OEM lines, stainless-steel lines resist expansion under pressure, delivering a firmer pedal feel and quicker brake response.

What's Included:

• 4-Piston DualComp calipers
• 14 in. two-piece slotted floating brake disc
• Performance brake pads
• Polished titanium handbrake cylinder and lever
• CNC-machined carbon steel caliper brackets
• D.O.T.-compliant stainless-steel braided brake lines
• All required installation hardware

Important Notes:

• The OEM handbrake will not function with this kit installed — the included DualComp handbrake system replaces it entirely.
• Compatible with 2WD applications only unless otherwise stated.
• Minimum 18-inch wheel required for clearance.
• This kit is built to order; please allow additional lead time for production and delivery.

The Ksport DualComp Big Brake Kit installs with minimal tools and requires no permanent vehicle modifications in most applications, making it one of the most capable and accessible rear brake upgrades available for drift and rally competitors.