Wilwood 120-13266 FSL4R-ST Left Hand Front Disc Brake Caliper

The Wilwood FSL4R-ST disc brake caliper combines advanced differential bore piston technology with Thermlock® heat-resistant pistons for exceptional performance under sustained hard braking conditions. Designed for dirt and asphalt oval racing, off-road, rally, and road course applications, this left-hand oriented caliper delivers superior pad wear characteristics and thermal management.

Key Features:

• Stress-flow forged from premium grade aluminum alloy billet for maximum strength
• Type III hard anodized finish for superior wear resistance and corrosion protection
• Thermlock® pistons provide ultimate heat protection in high-temperature braking environments
• Internal fluid ports eliminate external crossover tubes for cleaner installation
• Dual bleed screw assemblies enable left-hand/right-hand orientation without leading/trailing configuration
• Computer-optimized body design with closed-end bridges and radial transitions for increased strength
• Lightweight construction at just 4.4 lbs assembled weight
• Reduced deflection under load through elimination of sharp shoulders in critical stress areas

This left-hand FSL4R-ST caliper represents Wilwood's commitment to combining race-proven performance with cutting-edge engineering. The differential bore piston design optimizes pad wear while the Thermlock® pistons maintain consistent performance even under extreme thermal loads.