Wilwood 120-11330 Forged Superlite Internal Brake Caliper - FSLI4 4-Piston

The Wilwood FSLI4 (Forged Superlite Internal 4-Piston) disc brake caliper delivers professional-grade braking performance with advanced engineering for oval track, road course, rally, and off-road applications. This caliper combines differential bore piston technology for optimized pad wear with innovative internal fluid porting that eliminates external crossover tubes and their potential failure points.

Key Features:

• Internal Fluid Ports: Eliminates external crossover tubes, reducing potential leak points and damage from impact
• Reversible Mounting: Four bleed screw assemblies allow flexible mounting in leading or trailing positions on either right or left sides
• Differential Bore Pistons: Optimizes pad wear and braking force distribution across the rotor surface
• Lightweight Forged Construction: Weighs just 4.4 pounds while maintaining exceptional strength through stress-flow forging process
• Advanced Bridge Design: Closed-end bridges with radial transitions eliminate stress concentrations and resist deflection under extreme loads
• Stress-Flow Forged Body: Premium aluminum alloy billet forging realigns internal grain structure for superior strength and fatigue resistance
• Triple Bridge Bolt System: High-strength steel main bolts plus supplemental center bolt maximize body rigidity and prevent separation
• SRS Stainless Bridge Plates: Replaceable plates prevent abutment wear from pad gouging while eliminating pad rattle and reducing brake squeal
• Stainless Steel Pistons: Machined stainless construction resists corrosion, minimizes heat transfer, and eliminates deflection
• High-Temperature Seals: Square-faced O-rings provide positive sealing, controlled piston retraction, and extended service life
• Replaceable Bleed Screws: Two-piece assemblies ensure reliable, long-term serviceability

Engineered using computer-aided solid modeling and stress analysis, the FSLI4 represents the pinnacle of Wilwood's caliper technology. The stress-flow forging process creates a body that is stronger and more efficient than conventional billet-machined calipers at equal or lower weight. Ideal for racers and performance enthusiasts who demand sustained hard braking capability with maximum reliability.