Wilwood 120-11135 Forged Superlite Internal Caliper FSLI 6-Piston

The Wilwood Forged Superlite Internal (FSLI) caliper represents the pinnacle of brake caliper engineering for short track, late model, modified, open wheel, road race, off-road, rally, and sport driving applications. This 6-piston caliper delivers exceptional stopping power with reduced pedal travel through advanced materials and innovative design.

Stress-Flow Forged Construction:

Each FSLI caliper body is stress-flow forged from premium grade aluminum alloy billets, a process that re-aligns the metal's internal grain structure to flow within the contour of the caliper body. This eliminates the internal stresses and grain structure interruptions that occur in traditional machined billet calipers, resulting in significantly greater strength and resistance to deflection under load.

Advanced Engineering Features:

• Computer-generated solid modeling and stress analysis optimized design
• Closed-end bridges with radial transition to piston housings eliminate stress risers
• Center bridge bolts replace cotter pins for superior pad retention and quick access
• Replaceable SRS stainless steel bridge plates eliminate pad gouging and bridge wear
• Spring-loading action of SRS plates eliminates pad rattle and reduces brake squeal
• Stainless steel pistons resist corrosion and reduce heat transfer from pads
• High-temperature square-faced O-ring seals provide positive sealing and controlled piston retraction
• Two-piece bleed screw assemblies for reliable, long-lasting performance

Compatibility and Specifications:

Direct replacement for all Wilwood Superlite and similar competitive brand calipers with 3.50" centered mounting tabs. 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". Uses standard 7420 type bridge bolt brake pads compatible with all Superlite 6-piston calipers. Full range of Wilwood PolyMatrix pad compounds available to match specific application requirements.

Proven through rigorous clamping force, structural deflection, and volume displacement testing, the FSLI delivers measurably better performance than conventional billet calipers.