Wilwood 120-13228 Superlite FSL4R 4-Piston Brake Caliper

The Wilwood 120-13228 Superlite FSL4R is a high-performance 4-piston disc brake caliper designed for demanding racing applications. This caliper has become the benchmark in asphalt short track, late model, modified, and open wheel competition, while also excelling in road-race, rally, and sport driving environments.

Key Features:

• Internal fluid ports eliminate external crossover tubes for cleaner installation and reduced failure points
• Lightweight forged aluminum construction weighs just 4.4 pounds assembled
• Stress-flow forged from premium grade aluminum alloy billet for maximum strength
• Computer-generated solid modeling and stress analysis optimized design
• Closed end bridges with radial transitions provide exceptional rigidity and deflection resistance
• Eliminates machined steps and sharp shoulders in critical stress areas
• Four-piston design delivers consistent, powerful braking performance

The FSL4R caliper body represents advanced engineering with its seamless internal fluid routing and optimized weight-to-strength ratio. The forged construction and strategic design elements work together to resist deflection under heavy braking loads, ensuring consistent pedal feel and reliable performance in the most demanding racing conditions.