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 (Part Number: WIL120-11331) is engineered for demanding racing and off-road applications where consistent performance and heat management are critical. Featuring differential bore pistons, this caliper provides superior pad wear performance by compensating for mechanical loading and temperature variations across the pad face, significantly reducing taper wear during extended high-temperature braking. The inclusion of Thermlock® pistons in the ST models enhances heat protection by blocking heat transfer from the pads, leading to a reduction of up to 25% in caliper, fluid, and seal temperatures compared to standard stainless steel pistons, which improves overall brake system durability and performance. Designed for use on 1.25-inch diameter brake discs, this caliper is ideal for sustained hard braking on dirt and asphalt ovals, as well as off-road, rally, and road course racing scenarios. Its forged aluminum construction ensures light weight without sacrificing strength, delivering optimal handling and braking response. This caliper's robust design and advanced heat management features make it a reliable choice for serious racers and off-road enthusiasts seeking high-performance braking solutions. Suitable for a variety of demanding racing environments, the Wilwood Forged Superlite 4-ST caliper ensures precise braking control, extended component life, and enhanced safety during intense driving conditions.

Features:

• Differential bore pistons for improved pad wear performance

• Thermlock® pistons reduce heat transfer from pads, lowering temperatures by up to 25%

• Engineered for high-temperature sustained braking on dirt and asphalt ovals

• Lightweight forged aluminum construction for strength and reduced unsprung weight

• Designed for 1.25-inch diameter brake discs in racing and off-road applications