Wilwood 120-11138 FSLI4 Forged Superlite Differential Bore Brake Caliper

The Wilwood FSLI4 forged superlite caliper delivers exceptional strength and heat management for demanding racing applications. This differential bore caliper is engineered for sustained hard braking on dirt and asphalt ovals, road courses, rally, and off-road racing. At just 4.4 pounds assembled weight, the FSLI4 combines lightweight construction with superior structural integrity through advanced stress-flow forging technology.

Key Features:

• Internal fluid ports eliminate external crossover tubes and potential failure points
• Four bleed screw assemblies allow mounting in leading or trailing positions
• Differential bore pistons optimize pad wear performance and braking balance
• Stress-flow forged aluminum alloy body realigns internal grain structure for maximum strength
• Closed end bridges with radial transitions resist deflection under extreme loads
• High-strength steel main bridge bolts plus supplemental center bridge bolt prevent body separation
• Replaceable SRS stainless steel bridge plates prevent pad edge gouging and eliminate pad rattle
• Machined stainless steel pistons resist corrosion and heat transfer
• High-temperature square-faced O-ring seals provide controlled piston retraction
• Two-piece bleed screw assemblies for easy service and replacement

Computer-generated solid modeling and stress analysis ensure every detail of the FSLI4 maximizes strength while minimizing weight. The center bridge support provides positive pad retention with quick access for maintenance. This caliper represents the pinnacle of Wilwood's Superlite technology for professional racing applications where reliability and performance cannot be compromised.