Wilwood ST FSL4R Caliper for 1.88/1.75 Inch Pistons with 1.25 Inch Rotor

FSL4R/ST calipers provide the pad wear performance advantages of differential bore pistons with the option for ultimate heat protection using Thermlock® pistons in the ST models. Differential piston bores compensate for leading-edge mechanical loading and temperature variances across the pad face to reduce pad taper wear in sustained high temperature applications. Thermlock® pistons in the ST models block heat transfer from the pads and reduce temperatures in the caliper, fluid, and seals by up to 25% over standard stainless steel pistons. Featuring a wear resistant Type III hard anodize finish, these are the go-to calipers for all types sustained hard braking on dirt and asphalt ovals and a wide range of off-road, rally and road course applications.

The Wilwood ST FSL4R caliper is engineered for high-performance braking in demanding applications such as dirt and asphalt ovals, off-road racing, rally, and road courses. Featuring differential bore pistons, this caliper ensures even pad wear and optimized performance during sustained high-temperature braking. The differential piston design compensates for mechanical loading and temperature variations across the pad face, significantly reducing taper wear and enhancing brake longevity. The ST model is equipped with Thermlock® pistons, which effectively block heat transfer from the pads, leading to a temperature reduction of up to 25% in the caliper, fluid, and seals, thereby improving overall brake system reliability and preventing overheating issues during intense braking conditions. The caliper's durable Type III hard anodize finish provides exceptional wear resistance, ensuring long-lasting performance in off-road, rally, and high-stress racing environments. Designed to fit 1.88-inch and 1.75-inch pistons with a 1.25-inch rotor, this caliper offers versatile compatibility for a wide range of vehicles and racing setups. Its compact size and robust construction make it an ideal choice for racers seeking consistent, reliable braking performance under sustained hard braking scenarios. Whether used on dirt tracks or asphalt circuits, the Wilwood ST FSL4R caliper delivers exceptional stopping power, heat management, and wear resistance, making it a top choice for professional and enthusiast racers alike.

Features:

• Differential bore pistons for even pad wear and temperature compensation

• Thermlock® pistons for up to 25% reduction in heat transfer

• Type III hard anodize finish for wear resistance and durability

• Designed for 1.88-inch and 1.75-inch piston configurations

• Compatible with 1.25-inch rotors for versatile application

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1