Brembo 4KC.8042A GT Series 4-Piston Rear Big Brake Kit Cross-Drilled 345x28mm

The Brembo 4KC.8042A is a GT Series rear big brake kit featuring a 4-piston monobloc caliper and a 2-piece cross-drilled floating disc measuring 345mm x 28mm (13.58" x 1.10"). Engineered for drivers who demand superior stopping power on both the street and the track, this kit delivers a meaningful upgrade over factory braking systems.

The centerpiece of the kit is the 4-piston monobloc caliper, precision-machined from a single billet of cast aluminum for outstanding rigidity and minimal flex under hard braking. The rigid, fixed-caliper design delivers consistent, fade-resistant performance from initial pedal application through ABS intervention.

The 2-piece floating cross-drilled disc features a cast iron rotor attached to a precision-milled billet aluminum hat using Brembo's proprietary floating bobbin hardware. This design allows the disc to expand and contract thermally in both radial and axial directions, reducing thermal stress and extending disc life. The cross-drilled holes continuously clean and degas the pad surface, improve wet-weather braking, and aid in heat dissipation.

Key Features:

• Rotor Diameter: 345mm (13.58")
• Rotor Thickness: 28mm (1.10")
• Caliper Pistons: 4-Piston Monobloc design
• Disc Construction: 2-piece floating cross-drilled
• Disc Material: Proprietary high-carbon cast iron alloy with billet aluminum hat
• Axle Position: Rear
• Quantity: 1 Pair (both sides)
• Zinc-coated rotors for corrosion resistance
• Includes Brembo-engineered CNC billet caliper adapters and all necessary mounting hardware
• Compatible with factory master cylinder, ABS, and traction control systems

The Brembo GT Series is purpose-built for track day enthusiasts and performance-minded drivers seeking an upgrade over OEM brakes. Available in multiple caliper finish options to complement your build.