Wilwood 120-11129-RD Superlite FSLI 6-Piston Radial Mount Brake Caliper

The Wilwood Superlite FSLI series represents the pinnacle of racing brake caliper technology, trusted by short track, late model, modified, and open wheel competitors worldwide. This forged aluminum caliper combines innovative stress-flow forging with advanced engineering to deliver superior strength, reduced deflection, and improved braking performance.

Stress-Flow Forged Construction:

Each caliper body is precision-forged from premium grade aluminum alloy billets using a stress-flow forging process that re-aligns the metal's internal grain structure to follow the contour of the caliper body. This eliminates the internal stresses and grain interruptions that occur with conventional machining, resulting in the strongest possible aluminum caliper body.

Advanced FSL Body Design:

Computer-generated solid modeling and finite element stress analysis shaped the highly efficient FSL body design. Closed-end bridges with radial transitions to the piston housings eliminate sharp shoulders and machined steps in critical stress areas, measurably increasing overall body strength and resistance to deflection under high brake loads. Center bridge bolts replace traditional cotter pins for superior brake pad retention and quick access during pad changes.

Key Performance Features:

• Replaceable SRS stainless steel bridge plates eliminate bridge wear from pad gouging and extend caliper service life
• Spring-loading action of SRS plates eliminates pad rattle and dampens vibration harmonics that cause brake squeal
• High-temperature square-faced O-ring seals provide positive sealing, controlled piston retraction, and long service life in extreme heat
• Stainless steel pistons resist corrosion and retard heat transfer from brake pads
• Two-piece bleed screw assemblies for reliable, long-term service and easy replacement
• Direct replacement for all Wilwood Superlite and similar competitive calipers with 3.50" centered mounting tabs
• Compatible with 7420 type bridge bolt brake pads used in all Superlite 6-piston calipers
• Full range of PolyMatrix pad compounds available to match any application

Applications:

Ideal for road racing, off-road, rally, late model stock cars, modified racing, open wheel competition, and high-performance street applications requiring maximum stopping power with minimal pedal travel.

Available in multiple piston sizes (1.75", 1.62", 1.38", 1.25", 1.12") to accommodate 0.81", 1.10", and 1.25" rotor widths, allowing precise brake bias tuning for your specific application.