Wilwood 140-18271-D Rear Big Brake Kit with Drilled Rotors - FNSL4R/MC4 13.50in Black

The Wilwood 140-18271-D is a complete FNSL4R/MC4 rear big brake axle kit designed for high-performance street and track use. This kit pairs Wilwood's proven Forged Narrow Superlite 4R (FNSL4R) four-piston calipers with an integrated MC4 parking brake assembly, delivering a fully functional hydraulic parking brake solution alongside serious stopping power.

At the heart of this kit are oversized 13.50" drilled two-piece rotors that provide exceptional heat dissipation and a dramatic visual upgrade over factory brakes. The calipers feature a forged aluminum body with Type III Mil-Spec hard anodized finish in black, offering superior resistance to abrasion and corrosion. Thermlock pistons minimize heat transfer from the pads to the caliper body, reducing fade and extending seal and fluid service life.

Key Features:

• FNSL4R four-piston forged aluminum calipers with black Type III Mil-Spec hard anodized finish
• 13.50" drilled two-piece rotors for high-capacity heat management and aggressive styling
• MC4 parking brake assembly provides effective mechanical parking brake actuation
• BP-10 or BP-20 compound brake pads included for high-performance street and track use
• Thermlock pistons reduce heat transfer to minimize fade and extend component life
• Internal damper springs and high-temperature piston seals ensure consistent pedal feel
• Caliper piston volumes matched for full compatibility with OE master cylinder output and ABS systems
• Designed to complement front big brake upgrades on performance and custom builds
• Ideal pairing with big wheel, tire, and suspension upgrades

This rear brake kit is engineered to deliver balanced, high-capacity braking performance that complements front big brake upgrades. The FNSL4R calipers are fully compatible with OE ABS systems and standard master cylinder output, making this a direct-fit performance upgrade for serious enthusiasts.