Wilwood 120-13827 Superlite FSL4R 4-Piston Left Hand Brake Caliper

The Wilwood Superlite FSL4R (Forged Superlite 4 Radial) is a premium forged aluminum brake caliper designed for high-performance racing and sport driving applications. This left-hand caliper has been engineered to deliver exceptional stopping power while minimizing unsprung weight, making it the benchmark choice for asphalt short track, late model, modified, open wheel competition, road racing, rally, and performance street applications.

Key Features:

• Stress-flow forged from premium grade aluminum alloy billet for maximum strength and minimum weight
• Assembled weight of just 4.4 pounds reduces unsprung mass for improved suspension response
• Internal fluid ports eliminate external crossover tubes for cleaner installation and reduced leak points
• Four opposed pistons provide balanced clamping force and consistent pad wear
• Closed-end bridge design with radial transitions eliminates stress concentrations
• Computer-generated solid modeling and FEA stress analysis optimize body geometry
• Enhanced resistance to deflection under extreme braking loads
• Anodized finish provides corrosion protection and professional appearance

The FSL4R represents a significant advancement over previous Superlite designs, with the integrated internal fluid passages simplifying installation and improving reliability. The forged construction and optimized geometry deliver measurably greater rigidity than cast calipers, ensuring consistent pedal feel and maximum braking performance lap after lap.