Brembo 1J3.9030A3 GT Series Front Big Brake Kit with Type 3 Slotted 2-Piece Rotors

The Brembo 1J3.9030A3 is a GT Series front big brake kit engineered for drivers who demand superior stopping power, reduced brake fade, and race-proven thermal management. Part of Brembo's renowned Gran Turismo upgrade line, this complete axle kit replaces the OEM braking system with an oversized, high-performance assembly designed for demanding street, track day, and club event use.

Key Features:

• Type 3 Curved Slot Rotors: The Type 3 slotted pattern continuously refreshes the pad surface, removing dust and debris to maintain a stable and consistent friction coefficient under repeated hard braking
• 2-Piece Floating Rotor Construction: A cast-iron rotor ring is paired with a billet aluminum hat, reducing unsprung and rotating weight while improving thermal capacity and resistance to heat-related distortion
• Directionally Vented Discs: Rotor vanes are engineered to draw air through the disc for maximum cooling efficiency and extended fade resistance
• A-Series Aluminum Calipers: Radially mounted, fixed opposed-piston aluminum calipers deliver even clamping force, superior stiffness, and consistent pad wear across the full rotor surface
• Twin Seal Caliper Design: Dual seals protect the caliper internals from dirt, debris, and brake fluid contamination for long-term durability
• Complete Kit Contents: Includes matched rotors, calipers, high-performance brake pads, DOT/TUV-approved Goodridge stainless steel braided brake lines, CNC-machined caliper mounting brackets, and all necessary aircraft-grade hardware
• ABS and Traction Control Compatible: Designed to work seamlessly with factory ABS and electronic stability systems
• 2-Year Warranty: Backed by Brembo's standard two-year limited warranty against manufacturing defects

The Brembo GT Series big brake kit delivers a measurable improvement in braking performance, pedal feel, and thermal management over stock systems. Installation typically requires 17-inch or larger wheels to clear the oversized rotor and caliper assembly. Professional installation is recommended for optimal results.