Ksport BKAU051-445SO DualComp Rear 4-Piston Big Brake Kit with 14 in. Slotted Rotors

The Ksport BKAU051-445SO DualComp Big Brake Kit is a complete rear brake upgrade engineered for drivers who demand maximum stopping power and precise handbrake control. Developed with drifting and rally racing applications in mind, this kit delivers a dual-function braking solution in a single, clean package.

At the heart of the system is a single 4-piston caliper with a split-function design: two pistons are dedicated to the foot brake circuit and two pistons are dedicated to the handbrake circuit. Each circuit operates completely independently on its own hydraulic system, providing precise, consistent control over both braking inputs simultaneously.

Rotor Specifications:

• Rotor Diameter: 356 mm / 14 inches
• Rotor Style: Slotted
• Rotor Construction: Two-piece floating design
• Position: Rear
• Caliper Type: 4-Piston

The two-piece floating rotor design delivers a significant weight reduction — commonly up to 50% lighter than OEM rotors of equivalent size. The center hat is crafted from 6061-T6 aircraft-grade aluminum, which reduces rotational mass for sharper, more immediate brake response. The floating outer ring design also allows independent thermal expansion, dramatically reducing the risk of rotor warp under sustained heat load. The aluminum center section further acts as a heat sink, dissipating thermal energy away from the hub assembly more efficiently than cast iron alone.

What's Included:

• 4-Piston DualComp Brake Caliper(s)
• 14 in. Slotted Floating Brake Disc(s)
• Performance Brake Pads
• Handbrake hardware
• All required mounting hardware

Key Features:

• Formula Drift legal brake kit
• Complete bolt-on installation — no vehicle modifications required in most applications
• Independent foot brake and handbrake hydraulic circuits in a single caliper
• Slotted rotors recommended for track and performance driving applications
• Lightweight two-piece rotor construction up to 50% lighter than OEM
• 6061-T6 aircraft-grade aluminum rotor hat for reduced unsprung weight
• Fits 2WD vehicles (unless otherwise specified)
• Compatible with 18-inch wheels and above
• Backed by Ksport's 12-month manufacturer defect warranty

The Ksport DualComp system is ideal for competitive drivers seeking a Formula Drift-legal rear big brake upgrade that integrates foot brake and handbrake functionality into one high-performance unit. Built to order by Ksport for a precise, application-specific fit.