Wilwood 140-10692 Forged Superlite Big Brake Front Kit Road Race - 4R/ST 12.19in

The Wilwood 140-10692 Forged Superlite 4R/ST Big Brake Front Kit is a championship-proven brake system engineered specifically for dedicated road racing. Featuring four-piston FSL4R/ST calipers and 12.19-inch directional vane rotors, this kit delivers the thermal endurance and consistent stopping power demanded by sustained high-heat competition environments.

Forged Superlite 4R/ST Calipers

The FSL4R/ST calipers feature a forged aluminum body with a Type III Mil-Spec hard anodized medium gray finish. Hard anodizing delivers superior wear resistance in the piston bores along with high resistance to abrasion and corrosion throughout the caliper body. Thermlock pistons reduce heat transfer from the pads to the caliper fluid and seals, extending service life and increasing fade resistance under sustained racing conditions. Internal damper springs and high-temperature controlled-retraction piston seals maintain consistent pedal height from the start of the race to the finish.

Spec 37 Alloy GT Directional Vane Rotors

Two-piece 12.19-inch diameter Spec 37 alloy GT competition series directional vane rotors provide high cooling efficiency with rugged durability and thermal stability. Forged aluminum rotor mounting hats bolt directly to the factory hubs, minimizing unsprung and rotating weight without requiring hub replacement.

Caliper Volume Matching & Brake System Compatibility

Caliper piston volumes are matched for full compatibility with the OEM power brake booster and master cylinder. The kit is also easily configured for manual brake conversions and balance bar pedal setups using appropriately sized master cylinders.

Kit Includes:

• Two FSL4R/ST four-piston forged aluminum calipers — Type III Mil-Spec hard anodized gray finish
• Two 12.19-inch Spec 37 alloy GT series directional vane rotors with forged aluminum hats
• High-temperature, high-friction endurance race compound brake pads
• Machined billet radial mount caliper brackets with all premium-grade fasteners
• Stainless steel braided brake flexlines (Brake Line Kit 220-6458 included)
• Complete hardware kit for stock-location caliper mounting

Installation Notes:

Mounting brackets secure the calipers in the stock spindle location with minor spindle modifications required for bracket clearance. Details of the required spindle modifications are illustrated in the included assembly instructions.