Wilwood 140-18271-DR Rear Big Brake Kit with Drilled Rotors - FNSL4R/MC4 13.50

The Wilwood 140-18271-DR is a complete rear axle big brake kit featuring the Forged Superlite FNSL4R four-piston caliper paired with the MC4 parking brake assembly and oversized 13.50" drilled rotors. Engineered as a direct-bolt-on upgrade, this kit delivers high-capacity rear braking performance that is bias-matched to work seamlessly with Wilwood front big brake upgrades and the OE master cylinder.

The MC4 parking brake caliper provides a fully functional, integrated parking brake solution — a critical advantage over many aftermarket big brake systems that sacrifice e-brake functionality. The kit is engineered to maintain compatibility with the vehicle's ABS system and OE master cylinder output without requiring a brake bias valve modification in most configurations.

Key Features:

• FNSL4R Forged Superlite four-piston calipers — lightweight, high-rigidity forged aluminum construction
• MC4 parking brake assembly — retains full mechanical parking brake function
• 13.50" drilled rotors (DR) — vented, drilled design for improved heat dissipation and reduced unsprung weight
• BP-10 or BP-20 compound brake pads — suited for street performance through track day and autocross use
• Bias-matched to OE master cylinder output and ABS function
• Designed to complement Wilwood front big brake kits (FNSL6R or AERO6 calipers)
• Ideal for customized builds, high-performance street use, and motorsport applications
• Includes all required hardware for a complete bolt-on installation

Note: Rear kit requires a separate Wilwood parking brake cable kit for full MC4 parking brake integration. Covers both the S13 (1989–1994) and S14 (1995–1998) chassis generations.

The Wilwood 140-18271-DR is the ideal rear braking upgrade for performance builds seeking increased stopping power, enhanced durability, and a race-inspired appearance to complement big wheel, tire, and suspension modifications.