Ksport BKAU081-434CO DualComp Rear 4-Piston Big Brake Kit with 13 in. Drilled Rotors

The Ksport BKAU081-434CO DualComp Big Brake Kit is a complete all-in-one dual caliper rear brake upgrade engineered for high-performance driving, drifting, and rally racing applications. The innovative DualComp system integrates a single 4-piston caliper that handles both foot braking and handbrake functions within one compact unit — 2 pistons dedicated to the foot brake circuit and 2 pistons dedicated to the handbrake circuit, with each system operating fully independent of the other.

Featuring a 330mm (13 in.) cross-drilled floating rotor, the DualComp kit uses a two-piece rotor design with a lightweight 6061-T6 aircraft-grade aluminum center hat. This construction reduces rotational mass by up to 50% compared to OEM one-piece rotors of the same size, delivering faster brake response and improved heat dissipation. Because the outer rotor ring can expand and contract independently from the center section, the risk of rotor warping under sustained heat buildup is significantly reduced.

Key Features:

• 4-Piston DualComp Caliper — 2 pistons for foot brake, 2 pistons for handbrake, each on independent circuits
• 330mm (13 in.) Cross-Drilled Floating Rotor — recommended for street and dual-use applications for cooler running temperatures
• Two-Piece Rotor Design — 6061-T6 aircraft-grade aluminum center hat reduces rotational mass up to 50% vs. OEM
• CNC-Machined Carbon Steel Caliper Brackets — bolt directly to OEM caliper bracket location with no modifications required
• Polished Titanium Handbrake Cylinder and Lever — enhances feel and aids in precise driving control
• D.O.T.-Compliant Stainless-Steel Braided Brake Lines — included as standard
• Formula Drift Legal — tested and proven on drift and rally racing circuits
• Compatible with 17-inch wheels and larger

What's Included:

• DualComp 4-Piston Caliper(s)
• Floating Cross-Drilled Brake Disc
• Brake Pads
• Handbrake Assembly
• CNC-Machined Caliper Brackets
• Stainless-Steel Braided Brake Lines
• All Required Hardware

Important Notes: The OEM handbrake will not function with this kit installed — the Ksport DualComp handbrake system replaces it entirely. This big brake kit is a rear position application. Minimum wheel size of 17 inches is required. Kits are built to order.

Backed by a 12-month warranty covering manufacturer defects, the Ksport DualComp Big Brake Kit is the definitive bolt-on brake upgrade for drivers who demand race-proven stopping power and handbrake performance in a single, clean package.