Wilwood 140-14074 Front Disc Brake Kit Road Race GT Rotor - FSL6R/ST

The Wilwood 140-14074 is a dedicated road race front disc brake kit engineered for maximum stopping performance and endurance in sustained competition. Built around the Forged Superlite 4R/ST (FSL4R/ST) four-piston calipers, this kit delivers championship-proven braking with race-grade components throughout.

The FSL4R/ST calipers feature a forged aluminum body with Type III Mil-Spec hard anodized medium gray finish, providing superior wear resistance in the piston bores and high resistance to abrasion and corrosion. Thermlock® pistons reduce heat transfer from the pads to the caliper body, fluid, and seals — increasing fade resistance and extending service life under extreme thermal loads. Internal damper springs and high-temperature controlled-retraction piston seals ensure consistent pedal height from the start of a race to the finish.

Caliper piston volumes are matched for full compatibility with OE power brake boosters and master cylinders, and are easily adapted for manual brake conversions and balance bar pedal setups using appropriately sized master cylinders.

Rotor & Hat Specifications:

• 13.06" diameter Spec 37 alloy GT competition series directional vane rotors
• HD48 directional vane design maximizes cooling efficiency for sustained high-heat competition
• Solid (non-drilled, non-slotted) surface — compliant for classes where rotor drilling and slotting is prohibited
• Forged aluminum rotor hats minimize unsprung and rotating weight while mounting rotors to OE hubs

Kit Includes:

• FSL4R/ST four-piston forged aluminum calipers (pair)
• 13.06" Spec 37 alloy GT directional vane two-piece rotors (pair)
• PolyMatrix H compound high-temperature, high-friction endurance race pads
• Forged aluminum rotor hats
• Caliper mounting brackets with all premium-grade fasteners (stock spindle location, no modifications required)
• Stainless steel braided brake flexlines

The mounting system secures calipers directly to the factory spindle location without requiring any modifications, making this a true bolt-on road race brake upgrade. This complete front disc brake kit is finished with high-temperature endurance race compound pads selected specifically for this application.