Ksport BKAU320-434SO DualComp Rear 4-Piston Big Brake Kit 13 in. Slotted Rotors

The Ksport BKAU320-434SO DualComp Big Brake Kit is a complete rear brake upgrade engineered for drivers who demand independent foot brake and handbrake control from a single caliper assembly. Designed with drifting and rally racing in mind, this kit delivers race-proven stopping power in a clean, bolt-on package.

Dual-Function 4-Piston Caliper System:

At the heart of the DualComp system is a single 4-piston caliper that handles two separate braking circuits. Two pistons are dedicated to the foot brake and two pistons are dedicated to the handbrake, with each circuit operating completely independently on its own hydraulic system. This design eliminates the need for a secondary caliper while preserving full, precise handbrake functionality — a critical requirement for drift and rally competition.

Key Features:

• Rotor Diameter: 330 mm (13 in.) — slotted style for maximum heat dissipation under track conditions
• Caliper Type: 4-piston, rear position
• Two-piece floating rotor design — lightweight construction commonly up to 50% lighter than OEM one-piece rotors of equivalent size
• 6061-T6 aircraft-grade aluminum rotor center sections reduce rotational mass for quicker, more responsive braking
• Floating outer rotor ring expands and contracts independently from the center hat, significantly reducing warp risk from heat buildup
• CNC-machined carbon steel caliper brackets allow the larger caliper to bolt directly to the OEM caliper bracket location — no chassis modifications required
• Polished titanium handbrake cylinder and lever included for precise handbrake engagement and improved feel
• D.O.T.-compliant stainless-steel braided brake lines included as standard
• Formula Drift legal — tested and approved for competition use
• Compatible with 17-inch wheels and above

What's Included:

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

Important Notes: The OEM factory handbrake will not function with this kit installed — the included aftermarket handbrake assembly replaces it entirely. Ksport Big Brake Kits are built to order. This kit is designed for 2WD applications unless otherwise specified. A 12-month manufacturer defect warranty is included.