Wilwood 120-13227 Superlite FSL4R Forged Narrow Brake Caliper

The Wilwood Superlite FSL4R forged narrow caliper represents the pinnacle of performance braking technology for asphalt short track, late model, modified, and open wheel racing competition. This four-piston radial mount caliper has also earned its reputation in road racing, rally, and high-performance sport driving applications where uncompromising braking performance is essential.

Key Features:

• Stress-flow forged from premium grade aluminum alloy billet for maximum strength and minimal weight
• Ultra-lightweight design with assembled weight of just 4.4 pounds
• Internal fluid ports eliminate external crossover tubes for cleaner installation and reduced failure points
• Closed-end bridge design with radial transitions provides exceptional resistance to deflection under extreme braking loads
• Computer-generated solid modeling and finite element stress analysis ensures optimal strength-to-weight ratio
• Engineered without machined steps or sharp shoulders in critical stress areas for enhanced durability
• Four-piston radial mount configuration delivers balanced pad wear and consistent brake feel

The FSL4R caliper body design eliminates traditional weak points found in conventional calipers through advanced forging techniques and strategic material distribution. Each caliper undergoes rigorous quality control to meet Wilwood's exacting standards for professional racing and high-performance street applications.