Ksport BKBM031-435SO DualComp Rear Big Brake Kit 4-Piston 13 in. Slotted Rotors

The Ksport BKBM031-435SO DualComp Big Brake Kit is a complete, rear dual-caliper brake upgrade engineered for drivers who demand independent foot brake and handbrake control from a single caliper assembly. Developed with drifting and rally racing in mind, this kit delivers race-proven stopping power in a straightforward bolt-on package.

Dual-Function 4-Piston Caliper System:

The DualComp system's defining feature is its innovative single 4-piston caliper design — two pistons are dedicated to the hydraulic foot brake circuit, while the remaining two pistons operate the handbrake circuit. Both circuits function completely independently on their own hydraulic systems, giving the driver precise, separate control over service braking and the handbrake. A polished titanium handbrake cylinder and lever are included, enhancing both function and appearance.

Lightweight Two-Piece Floating Rotor:

The kit features a 330mm (13 in.) slotted, two-piece floating brake disc. The outer iron ring floats independently from the center hat, dramatically reducing the risk of warping from heat buildup during aggressive driving. The center hat is machined from 6061-T6 aircraft-grade aluminum, which cuts rotational mass significantly — Ksport rotors commonly weigh up to 50% less than OEM rotors of equivalent size. Aluminum's superior thermal conductivity also allows the hat to act as an effective heat sink, transferring heat away from the rotor surface faster.

CNC-Machined Caliper Brackets & Braided Lines:

CNC-machined carbon steel caliper brackets are included to ensure a precise, direct fit at the OEM caliper bracket location — no cutting or fabrication required. DOT-compliant stainless-steel braided brake lines are standard equipment in every kit, replacing rubber OEM lines for improved pedal feel and fade resistance.

Formula Drift Legal:

This big brake kit is Formula Drift legal and is designed for use with 17-inch wheels and larger.

What's Included:

• 4-Piston DualComp caliper(s)
• 330mm (13 in.) slotted two-piece floating brake disc(s)
• Performance brake pads
• Polished titanium handbrake cylinder and lever
• CNC-machined carbon steel caliper bracket(s)
• DOT-compliant stainless-steel braided brake lines
• All required installation hardware

The DualComp system installs with minimal tools and requires no permanent vehicle modifications in most applications. A 12-month warranty covering manufacturer defects is included with every kit.