Wilwood 140-14262-D FNSL4R-MC4 Big Brake Rear Disc Brake Kit 12.88" Drilled Currie Pro-Tour Floater

The Wilwood FNSL4R-MC4 Big Brake Rear Axle Kit delivers a high-performance disc brake solution with integrated parking brake capability, designed to complement front big brake upgrades on high-performance and custom street vehicles. Engineered around the proven Forged Narrow Superlite 4R (FNSL4R) caliper platform and the MC4 mechanical parking brake assembly, this kit provides serious stopping power without sacrificing a functional, clean-looking parking brake system.

Key Features:

• FNSL4R Four-Piston Calipers — Forged billet aluminum construction delivers exceptional clamping force and thermal resistance
• 12.88" Drilled Two-Piece Rotors — Oversized rotor diameter maximizes heat dissipation and braking torque; drilled surface aids in pad degassing and reduced weight
• BP-10 High-Performance Brake Pads — Compound optimized for street and high-performance use, matched to OE master cylinder output and ABS system requirements
• MC4 Mechanical Parking Brake Assembly — Internally hidden shoe mechanism provides superior static holding power with a clean, uncluttered installation
• Currie Pro-Tour Unit Bearing Floater Compatible — Specifically designed to bolt up to Currie Pro-Tour floater rear axle assemblies
• OE-Compatible Brake Balance — Engineered to work within factory ABS function and individual vehicle front-to-rear brake bias requirements
• Optional Caliper Finishes & Rotor Styles — Allows builders to match brake aesthetics to big wheel, tire, and suspension upgrades

The FNSL4R-MC4 kit is an ideal upgrade for builders looking to add rear disc brakes with a reliable parking brake to custom, show, and high-performance street machines. The oversized 12.88" rotors and four-piston calipers deliver the high brake capacity needed to balance aggressive front big brake setups, while the concealed MC4 parking brake mechanism keeps the installation looking factory-clean behind large-diameter wheels.