Wilwood 120-11131 Forged Superlite FSLI Brake Caliper - 6-Piston

The Wilwood Forged Superlite FSLI (Forged SuperLite Internal) represents the pinnacle of high-performance brake caliper engineering for short track, late model, modified, and open wheel racing applications. This caliper also excels in road racing, off-road, rally, and aggressive sport driving environments where maximum stopping power and reliability are essential.

Stress-Flow Forged Construction:

Each FSLI caliper body is precision-forged from premium-grade aluminum alloy billets using an advanced stress-flow forging process. This manufacturing technique realigns the metal's internal grain structure to follow the contour of the caliper body, eliminating the internal stresses and grain interruptions that occur when machining conventional billet aluminum. The result is measurably superior strength and rigidity compared to standard machined calipers.

Optimized Body Design:

Developed through computer-generated solid modeling and finite element stress analysis, the FSL body features closed-end bridges with radial transitions to the piston housings. This design eliminates stress-concentrating steps and sharp shoulders, providing exceptional resistance to deflection under heavy braking loads. Center bridge bolts replace traditional cotter pins for improved structural support and quick pad access with positive retention.

Key Features:

• Replaceable SRS (Stainless Radial System) stainless steel bridge plates eliminate pad gouging and extend caliper service life
• SRS plates provide spring-loading action to eliminate pad rattle and dampen vibration harmonics that cause brake squeal
• High-temperature square-faced O-ring seals ensure positive sealing, controlled piston retraction, and long service life in extreme heat
• Stainless steel pistons resist corrosion and reduce heat transfer from brake pads
• Two-piece bleeder screw assemblies for reliable, long-term performance and easy serviceability
• Direct replacement for Wilwood Superlite and similar competitive calipers with 3.50" centered mounting tabs
• Uses 7420-type bridge bolt brake pads compatible with all Superlite 6-piston calipers

Available Configurations:

FSLI calipers are available in multiple piston bore sizes including 1.75", 1.62", 1.38", 1.25", and 1.12" to accommodate rotor widths of 0.81", 1.10", and 1.25". Compatible with the full range of Wilwood PolyMatrix pad compounds to optimize brake response and heat management for your specific application.

Performance testing has proven the FSLI delivers superior stopping power with reduced pedal travel and exceptional consistency under demanding racing conditions.