Wilwood 120-11329 Forged Superlite Internal Brake Caliper - 4-Piston

The Wilwood 120-11329 FSLI4 (Forged Superlite Internal) caliper delivers professional-grade braking performance with advanced differential bore piston technology. Engineered for sustained hard braking on dirt and asphalt ovals, off-road, rally, and road course applications, this caliper combines exceptional strength with lightweight construction at just 4.4 pounds assembled weight.

Key Features:

• Internal fluid ports eliminate external crossover tubes and potential failure points from damaged lines
• Four bleed screw assemblies allow versatile mounting in either leading or trailing positions with left or right-hand orientation
• Stress-flow forged aluminum body from premium grade billet realigns internal grain structure for superior strength and deflection resistance
• Differential bore pistons provide optimized pad wear performance and balanced braking force
• High-strength steel bridge bolts with supplemental center bolt maximize resistance to body separation under extreme loads
• Replaceable SRS stainless steel bridge plates prevent pad edge gouging, eliminate pad rattle, and dampen vibration harmonics
• Machined stainless steel pistons resist corrosion, reduce heat transfer, and prevent backside deflection under pressure
• High-temperature square-faced o-ring seals ensure positive sealing, controlled piston retraction, and extended service life
• Closed-end bridges with radial transitions eliminate stress risers and sharp shoulders for measurable strength increases
• Two-piece bleed screw assemblies provide reliable, long-lasting service and easy replacement

Computer-generated solid modeling and stress analysis technology optimizes every aspect of the FSLI4 body design. The center bridge support provides positive pad retention while allowing quick access during service intervals. This caliper represents the pinnacle of aluminum brake caliper engineering, delivering unmatched strength-to-weight performance for demanding motorsports applications.