Wilwood Forged Superlite FSL4R/ST Aluminum Brake Caliper with Thermlock Pistons – Left

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 Forged Superlite FSL4R/ST Aluminum Brake Caliper is engineered for high-performance braking in demanding racing and off-road environments. Featuring differential bore pistons, these calipers optimize pad wear and improve braking consistency under sustained high-temperature conditions. The FSL4R/ST models are equipped with Thermlock® pistons, which significantly reduce heat transfer from the pads to the caliper, fluid, and seals by up to 25%, enhancing overall brake system durability and performance. The calipers are designed with a wear-resistant Type III hard anodize finish, providing exceptional resistance to the harsh conditions encountered during off-road, rally, dirt oval, and road course racing. These features make the FSL4R/ST an ideal choice for vehicles subjected to prolonged heavy braking and extreme thermal loads, ensuring reliable stopping power during intense driving sessions. The caliper's forged aluminum construction combines lightweight design with high strength, contributing to better vehicle handling and reduced unsprung mass. Suitable for left-side installation, this caliper pairs perfectly with a range of brake setups requiring a 1.88-inch and 1.75-inch piston configuration, and an 0.81-inch disc diameter, making it versatile for various high-performance applications. The design emphasizes both durability and heat management, making it a top choice for racers and off-road enthusiasts aiming to maintain optimal braking performance under demanding conditions.

Features:

• Differential bore pistons: Improve pad wear performance and reduce taper wear during high-temperature operation

• Thermlock® pistons: Block heat transfer, reducing caliper, fluid, and seal temperatures by up to 25%

• Hard anodized finish: Provides wear resistance and longevity in harsh environments

• Forged aluminum construction: Offers lightweight strength and durability

• Designed for high-performance racing and off-road use: Suitable for dirt ovals, rally, off-road, and road course applications

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