Wilwood 140-18155-D Front FNSL6R Big Brake Kit 12.88in Rotor 6-Lug SRP Drilled

The Wilwood 140-18155-D is a front big brake kit built around the Forged Narrow Superlite 6R (FNSL6R) six-piston caliper — one of Wilwood's most capable street performance caliper platforms. This kit features a 12.88-inch drilled rotor with a 6-lug hub configuration and is finished in Wilwood's signature SRP (Street Performance) drilled rotor style, delivering both aggressive aesthetics and improved heat dissipation.

Engineered application-specific for simplified bolt-on installation, this kit is designed for full compatibility with the OEM master cylinder output and ABS systems where equipped — no master cylinder upgrade required.

Key Features:

• Forged Narrow Superlite 6R (FNSL6R) six-piston calipers for maximum clamping force and thermal stability
• 12.88-inch drilled rotors for enhanced cooling and reduced unsprung weight
• 6-lug hub fitment for direct bolt-on installation
• Application-specific engineering ensures OEM master cylinder and ABS compatibility
• Increased braking capacity compared to factory drum or single-piston disc setups
• Available in multiple caliper finish options to complement custom wheel and suspension builds
• Complements wheel, tire, and suspension upgrades on show trucks and high-performance street applications
• Requires 17-inch or larger wheels for proper caliper clearance

This kit is part of Wilwood's Street Performance (SRP) big brake lineup — purpose-built for builders seeking a significant upgrade in braking performance and style on classic GM trucks and SUVs. Optional caliper finishes and rotor designs allow full personalization to match any build aesthetic.