Wilwood 120-11129 FSLI Forged Superlite Brake Caliper - 6-Piston

The Wilwood FSLI (Forged Superlite Internal) caliper represents the pinnacle of racing brake technology, designed for short track, late model, modified, and open wheel competition. This advanced caliper also excels in road racing, off-road, rally, and high-performance street applications.

Stress-Flow Forged Construction:

Each caliper body is stress-flow forged from premium grade aluminum alloy billets. This forging process re-aligns the metal's internal grain structure to flow within the contour of the caliper body, eliminating the stresses and grain interruptions that occur with traditional billet machining. The result is unmatched strength and rigidity in an aluminum caliper body.

Advanced Engineering Design:

• Computer-generated solid modeling and finite element stress analysis optimize body geometry
• Closed-end bridges with radial transitions to piston housings eliminate stress concentrations
• Center bridge bolts replace cotter pins for superior pad retention and quick access
• Delivers measurably better stopping power with reduced pedal travel and body deflection

Premium Performance Features:

• Replaceable SRS (Stainless Rotor Surfaces) bridge plates eliminate pad gouging and extend caliper life
• Spring-loaded SRS plates eliminate pad rattle and dampen vibration to reduce brake squeal
• High-temperature square-face O-ring seals provide positive sealing and controlled piston retraction
• Stainless steel pistons resist corrosion and reduce heat transfer from brake pads
• Two-piece bleed screw assemblies for reliable, long-lasting service

Compatibility:

FSLI calipers are direct replacements for all Wilwood Superlite and similar competitive brand calipers with 3.50" centered mounting tabs. Available in multiple piston sizes (1.75", 1.62", 1.38", 1.25", and 1.12") to accommodate various rotor widths (.81", 1.10", and 1.25"). Uses standard 7420 type bridge bolt brake pads compatible with all Superlite 6-piston calipers, with full range of Wilwood PolyMatrix pad compounds available.