Wilwood 140-16117 Forged Superlite 4R Road Race Front Big Brake Kit 12.19in Rotor with Lines

The Wilwood 140-16117 Forged Superlite 4R Road Race Front Big Brake Kit is purpose-built for dedicated road racing applications. Engineered around Wilwood's proven FSL4R/ST four-piston calipers and a 12.19-inch directional vane rotor, this complete bolt-on front brake kit delivers championship-level stopping power without requiring spindle modifications.

FSL4R/ST Four-Piston Calipers

The forged aluminum caliper bodies feature a Type III Mil-Spec hard anodized medium gray finish, providing superior wear resistance in the piston bores along with outstanding resistance to abrasion and corrosion. Thermlock® pistons are incorporated to minimize heat transfer from the brake pads, reducing fade and extending caliper, fluid, and seal service life. Internal damper springs and high-temperature controlled-retraction piston seals maintain consistent pedal height throughout race sessions.

Spec37 GT Competition Series Rotors

The 12.19-inch diameter Spec37 alloy GT competition series directional vane lug mount rotors deliver high cooling efficiency with rugged durability and thermal stability under sustained high-heat racing conditions. Forged aluminum dynamic lug mount hats securely mount the rotors to the OE hubs.

Bolt-On Installation

Precision-machined mounting brackets and premium-grade fasteners secure the calipers directly to the OE spindles in the stock location — no cutting, welding, or spindle modifications required. Caliper piston volumes are matched for full compatibility with the OE power brake booster and master cylinder, and are easily configured for manual brake conversions and balance bar pedal setups using appropriately sized master cylinders.

Key Features:

• FSL4R/ST forged aluminum four-piston calipers with Type III Mil-Spec hard anodized finish
• Thermlock® pistons for superior fade resistance and extended service life
• Internal damper springs and high-temperature piston seals for consistent pedal feel
• 12.19-inch Spec37 alloy GT competition series directional vane lug mount rotors
• Forged aluminum dynamic lug mount rotor hats
• Bolt-on caliper mounting brackets with premium fasteners — no spindle modifications needed
• High-temperature, high-friction endurance race compound brake pads included
• Stainless steel braided flex lines included for a complete installation
• OE power brake booster and master cylinder compatible

Important Note: This kit is configured with high-temperature road racing brake pads. Extended use at low operating temperatures may accelerate rotor and pad wear. Always verify wheel clearance prior to installation.