Brembo 2P3.8042AS GT|S M4 Rear Big Brake Kit 345x28mm 2-Piece Type-3 Slotted Disc Black Hard Anodized Caliper

The Brembo 2P3.8042AS GT|S Big Brake Kit is a complete rear axle braking upgrade engineered for drivers who demand motorsport-level stopping power on the street or track. This kit features a 345x28mm (13.6") 2-piece floating disc paired with a 4-piston cast monobloc radial-mount caliper finished in a hard anodized black (M4) coating for lasting durability and aggressive aesthetics.

The Type-3 (TY3) slotted disc pattern is Brembo's motorsport-derived slot design that continuously refreshes the pad surface, removing debris and gases to maintain a stable and consistent friction coefficient under aggressive use. The 2-piece disc construction uses a high carbon alloy iron rotor face mounted to a lightweight aluminum hat via floating D-bobbins with anti-rattle springs, dramatically increasing thermal capacity while reducing unsprung weight.

The GT|S series positions itself as the bridge between high-performance street driving and track day demands. The cast monobloc caliper body is machined from a single piece of aluminum, ensuring superior rigidity and minimized flex under heavy braking loads compared to a two-piece composite caliper. Internal fluid routing eliminates external brake line fittings on the caliper body for a cleaner look and improved functionality.

Key Specifications:

• Axle Position: Rear
• Disc Size: 345x28mm (13.6" x 1.1")
• Disc Construction: 2-Piece Floating Composite
• Disc Type: Type-3 (TY3) Slotted
• Disc Material: Advanced High Carbon Alloy with corrosion-resistant plating
• Disc Vane Design: Vented Curved 48-Vane
• Caliper Body: Cast Monobloc Radial Mount (M4)
• Caliper Pistons: 4-Piston Opposed
• Caliper Finish: Black Hard Anodized
• Brake Pads: Brembo High Performance FM1000 compound
• Part Number: 2P3.8042AS (Type-3 Slotted variant)

What's Included:

• 2x 345x28mm 2-piece slotted rotors (complete axle set, pre-assembled)
• 2x 4-piston cast monobloc calipers, black hard anodized
• Brembo FM1000 high-performance brake pads
• Proprietary Brembo stainless steel braided brake lines by Goodridge
• Brembo-engineered CNC billet caliper adapters
• All necessary mounting hardware for installation

The 2P3.8042AS is a special-order, made-to-order kit assembled to specification. It is a direct companion to the Brembo front GT|S kit for a complete system upgrade on supported platforms.