Wilwood 140-14262 FNSL4R-MC4 Big Brake Rear Axle Kit 12.88in Currie Pro-Tour Floater

The Wilwood 140-14262 Forged Narrow Superlite 4R / MC4 Big Brake Rear Axle Kit is a complete disc brake conversion designed for Currie Pro-Tour unit bearing floater rear axle assemblies. This kit delivers a purpose-built solution for adding high-performance rear disc brakes with an integrated parking brake — making it the ideal complement to front big brake upgrades on late-model high-performance and custom-built vehicles.

At the heart of this kit are the FNSL4R four-piston calipers paired with BP-10 compound brake pads and an oversized 12.88-inch two-piece rotor. The system is engineered to match OE master cylinder output, maintain ABS system compatibility, and satisfy individual vehicle front-to-rear brake bias requirements — no proportioning valve guesswork required.

The MC4 parking brake assembly uses a neatly hidden internal shoe mechanism that provides clean, unobtrusive installation with strong static holding power for parking applications. This design keeps the brake hardware visually clean while delivering reliable e-brake function.

Key Features:

• Forged Narrow Superlite 4R (FNSL4R) four-piston calipers for high-capacity braking force
• 12.88-inch oversized two-piece rotors for enhanced thermal capacity and fade resistance
• BP-10 high-performance brake pad compound optimized for street and performance driving
• Integrated MC4 parking brake assembly with internal shoe design for a clean installation
• Compatible with OE master cylinder output and ABS systems
• Engineered to balance with front big brake upgrades on performance applications
• Designed specifically for Currie Pro-Tour unit bearing floater rear axle assemblies
• Optional caliper finishes and rotor styles available to match custom builds

The Wilwood 140-14262 is the go-to rear brake upgrade for builders seeking increased stopping power, improved durability, and race-inspired aesthetics to complement big wheel, tire, and suspension packages on street machines, show cars, and high-performance vehicles with elevated brake demands.