Brembo 4K3.8037AX GT Big Brake Kit 4-Piston Caliper Upgrade

The Brembo 4K3.8037AX is a high-performance Big Brake Kit (BBK) from Brembo's renowned GT series, engineered for enthusiasts and track-day drivers who demand superior stopping power and fade resistance beyond what stock braking systems can offer.

Brembo's GT Big Brake Kits are built around rigid, lightweight aluminum monobloc or two-piece calipers paired with large-diameter, slotted and/or cross-drilled high-carbon iron rotors. The result is dramatically improved thermal capacity, consistent pedal feel, and reduced brake fade under repeated hard stops.

Key Features:

• Multi-piston aluminum caliper for even pad clamping force and reduced flex
• High-carbon iron rotor for superior heat dissipation and crack resistance
• Slotted and/or cross-drilled rotor surface to evacuate gas, dust, and water
• Brembo high-performance brake pads included for immediate performance out of the box
• Direct-fit design using bolt-on caliper brackets — no cutting or welding required
• Finished in Brembo's signature styling for a premium appearance behind the wheel
• Complete kit includes caliper(s), rotor(s), pads, brackets, and hardware

Brembo is an OEM brake supplier to Ferrari, Lamborghini, Porsche, and other leading performance manufacturers, making the GT series a trusted choice for street and motorsport applications. The 4K3.8037AX kit delivers the stopping confidence and consistency required for spirited driving and track use.