Wilwood 140-18155-DR Front FNSL6R Big Brake Kit 12.88" Rotor 6-Lug SRP Red Caliper

The Wilwood 140-18155-DR is a complete front big brake upgrade kit built around the legendary Forged Narrow Superlite 6R (FNSL6R) six-piston caliper finished in high-temperature SRP Red powder coat. Designed specifically for 1971–1991 Blazer applications with a 6-lug hub configuration, this kit delivers a dramatic improvement in stopping power over OEM brakes while maintaining full compatibility with your existing master cylinder and ABS system where applicable.

At the heart of this kit is a 12.88-inch diameter rotor paired with Wilwood's forged billet aluminum six-piston caliper — a combination that increases swept area and thermal mass to handle the demands of heavy-duty and performance-modified trucks. The FNSL6R caliper design features staggered pistons that distribute clamping force evenly across the full pad face for consistent, fade-resistant braking.

Key Features:

• Forged Narrow Superlite 6R (FNSL6R) six-piston caliper in SRP Red finish
• 12.88" diameter performance rotor for maximum swept area
• Application-specific engineering for simplified, bolt-on installation
• Compatible with OE master cylinder output — no proportioning valve modifications required
• Maintains ABS function where originally equipped
• 6-lug hub fitment for 1971–1991 Blazer applications
• Forged billet aluminum caliper construction for strength and reduced unsprung weight
• Complements wheel, tire, and suspension upgrades with added style and function

Wilwood's FNSL6R big brake kits are engineered as application-specific solutions, meaning all hardware, brackets, and components are included for a straightforward installation without custom fabrication. This kit is an ideal upgrade for trucks that have received suspension lifts, larger wheels and tires, or engine performance modifications that demand greater braking capability to match.