Ksport BKAU031-434CO DualComp Rear 4-Piston Big Brake Kit with 13 in. Drilled Rotor

The Ksport BKAU031-434CO DualComp Big Brake Kit is a complete, bolt-on rear brake upgrade engineered for drivers who demand precise foot brake and handbrake control from a single, unified caliper assembly. Designed with drifting and rally racing in mind, this kit delivers race-proven stopping power with a straightforward installation process.

Innovative Dual-Function 4-Piston Caliper:

• Single 4-pot caliper handles both braking functions — 2 pistons dedicated to the foot brake, 2 pistons dedicated to the handbrake
• Each circuit operates fully independently on its own hydraulic system for precise, isolated control
• Formula Drift legal — tested and approved for competitive drift and rally racing applications
• Compatible with 17-inch wheels and larger

Lightweight Two-Piece Floating Rotor Design:

• 330mm (13 in.) drilled rotor for improved heat dissipation and consistent bite
• Two-piece floating construction allows the outer rotor ring to expand and contract independently, greatly reducing warp risk from thermal stress
• Center hat crafted from 6061-T6 aircraft-grade aluminum for reduced rotational and unsprung mass — rotors commonly weigh up to 50% less than OEM equivalents
• Aluminum center sections act as effective heat sinks, channeling heat away from the braking surface faster than cast-iron one-piece designs

Complete Bolt-On Kit — Everything Included:

• 4-Piston DualComp calipers
• Two-piece floating drilled brake disc
• Brake pads
• Handbrake hardware
• All required mounting hardware

Note: The OEM handbrake will not function after installation. This kit replaces the factory handbrake system entirely. Designed for easy installation with minimal tools required and no permanent vehicle modifications in most applications. Backed by Ksport's 12-month warranty covering manufacturer defects.