Brembo 2S1.9015A1 GT BM4 Rear Big Brake Kit - 380x28mm 2-Piece Drilled Rotors, 4-Piston Monobloc Calipers, Black

The Brembo GT Series BM4 Rear Big Brake Kit represents the pinnacle of Brembo's high-performance braking technology, delivering professional-grade stopping power for both street and track use. This complete rear axle brake system features advanced billet monoblock calipers paired with oversized 2-piece floating rotors designed for enthusiasts who demand maximum performance.

Advanced BM4 Billet Monoblock Calipers

The heart of this system is Brembo's revolutionary BM4 4-piston caliper, manufactured using an innovative 4D casting process that represents a breakthrough in automotive brake caliper technology. Each caliper is machined from a single billet of cast aluminum, providing exceptional rigidity and minimal deformation under extreme braking conditions. Unlike conventional calipers with external brake lines, the BM4 features internal fluid channels that improve both performance and aesthetics while reducing the risk of damage. The hidden bleeding screw integrates seamlessly into the caliper's sleek design, delivering both form and function.

High-Performance 380x28mm 2-Piece Rotors

The kit includes cross-drilled 380mm (15-inch) diameter by 28mm thick 2-piece floating rotors that dramatically increase thermal capacity and heat dissipation compared to stock braking systems. The 2-piece design features a high-carbon iron rotor ring with corrosion-resistant plating mounted to an aluminum hat, reducing unsprung weight while improving cooling efficiency. The drilled rotor surface helps evacuate brake dust and gases, maintains consistent pad contact, and reduces brake fade during aggressive driving or track use. The advanced pillar vane design increases resistance to thermal cracking by over 40% compared to conventional rotors.

Complete Performance Package

This comprehensive brake kit arrives pre-assembled and includes everything needed for installation: BM4 4-piston monobloc calipers in black finish with Brembo logo, 2-piece drilled rotors, high-performance brake pads engineered for both street and track use, stainless steel braided brake lines for improved pedal feel, CNC-machined billet caliper mounting brackets, and all necessary hardware. The fixed opposed-piston caliper design ensures even pad pressure distribution and uniform wear across the friction surface.

Motorsport-Derived Technology

Brembo's GT Series systems bring decades of racing experience directly to your vehicle. The BM4 calipers feature racing-derived technical specifications typically found only in billet or forged competition calipers, including optimized body architecture and advanced thermal management. The multiple piston design with varying diameters provides superior clamping force distribution, resulting in more immediate brake response, enhanced modulation, and consistent performance during repeated hard stops.

Key Features:

• 4-piston billet monoblock calipers with internal fluid channels
• 380x28mm (15.0" x 1.1") 2-piece cross-drilled floating rotors
• High-performance brake pads included
• Stainless steel braided brake lines
• CNC-machined billet caliper mounting brackets
• Black caliper finish with Brembo logo
• Complete hardware kit for rear axle installation
• Improved heat dissipation and fade resistance
• Enhanced pedal feel and modulation
• Reduced unsprung weight compared to OEM components

Note: This kit includes parking brake functionality. Professional installation is strongly recommended. Confirm vehicle-specific fitment before ordering.