Brembo 4K3.8030AX GT Big Brake Kit Cross-Drilled - 4-Piston

The Brembo 4K3.8030AX is a complete GT-series Big Brake Kit (BBK) engineered for drivers who demand superior stopping performance on both the street and track. Drawing on Brembo's decades of motorsport expertise — including Formula 1 and MotoGP development — this kit delivers a significant upgrade over factory braking systems through larger rotors, stiffer calipers, and advanced friction materials.

Key Features:

• 4-Piston Aluminum Caliper: Rigid fixed-mount design minimizes flex and provides consistent, fade-resistant pedal feel under repeated hard stops
• Cross-Drilled Rotor (AX finish): Precision cross-drilled disc promotes heat dissipation, eliminates brake dust and gases, and reduces rotor weight for improved unsprung mass
• High-Performance Brake Pads: Brembo-matched friction compound included, optimized for both street and performance driving conditions
• Stainless Steel Braided Brake Lines: Included for improved pedal firmness and fluid pressure consistency
• CNC-Machined Caliper Adapters: Brembo-engineered billet adapters ensure precise caliper positioning and a direct-fit installation
• Complete Hardware Kit: All necessary mounting fasteners, retaining clips, and installation hardware included

Brembo GT Big Brake Kits are designed and validated to TÜV/DOT standards, making them road-legal while delivering track-capable performance. The kit's larger rotor diameter increases thermal mass and improves heat management during aggressive driving, while the multi-piston caliper delivers improved clamping force and braking consistency compared to OEM single-piston sliding calipers. Backed by Brembo's two-year warranty against manufacturing defects.