Wilwood Caliper-Forged Superlite 4-ST 1.88/1.75in Pistons 1.25in Disc

FSLI4 and FSLI4/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. 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 Forged Superlite 4-ST caliper is engineered for high-performance applications, offering superior pad wear performance through differential bore pistons. These pistons help compensate for mechanical loading and temperature variations across the pad face, promoting even pad wear during sustained high-temperature braking. The caliper's design ensures durability and consistent braking power in demanding environments such as off-road racing, rally, and road course events. The inclusion of Thermlock® pistons in the ST models provides an additional layer of heat protection by reducing heat transfer from the pads, lowering temperatures in the caliper, fluid, and seals by up to 25% compared to standard stainless steel pistons. This feature makes the caliper ideal for extended hard braking on dirt and asphalt ovals, as well as other high-stress racing scenarios. The forged aluminum construction guarantees strength without excessive weight, enhancing overall vehicle handling and responsiveness. Designed to fit a 1.25-inch disc, the Wilwood Superlite 4-ST caliper combines advanced thermal management with precise braking performance, making it a reliable choice for serious racers and off-road enthusiasts alike. Whether you're upgrading your race car or building a dedicated off-road vehicle, this caliper delivers consistent, fade-resistant braking performance under the most demanding conditions.

Features:

• Differential bore pistons for improved pad wear performance and temperature compensation

• Thermlock® pistons in ST models provide up to 25% reduction in heat transfer, protecting caliper components

• Forged aluminum construction for strength and lightweight performance

• Designed for 1.25-inch disc applications, ideal for high-stress racing and off-road use

• Optimized for sustained high-temperature braking on dirt, asphalt ovals, and rally courses