Wilwood Forged Superlite 4 Caliper with 1.88/1.75 Inch Pistons and .81 Inch Disc - Part #120-11138

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 caliper, part number 120-11138, is engineered for high-performance braking in demanding racing and off-road applications. Featuring differential bore pistons, this caliper ensures consistent pad wear by compensating for mechanical loading and temperature variations across the pad face, making it ideal for sustained high-temperature conditions. The caliper's design effectively reduces taper wear, improving braking performance and pad longevity during extended hard braking on dirt and asphalt ovals, rally stages, and road courses.
For enhanced heat management, the ST models include Thermlock® pistons that block heat transfer from the pads, lowering temperatures in the caliper, fluid, and seals by up to 25% compared to standard stainless steel pistons. This advanced heat protection helps maintain brake pedal feel and responsiveness under extreme conditions.
Built with forged aluminum, the Wilwood Superlite 4 caliper combines durability with reduced weight, ensuring optimal vehicle handling and minimizing unsprung mass. Its versatile design makes it suitable for a wide range of motorsport and off-road scenarios where reliable, high-performance braking is essential. Whether used in rally racing, off-road, or high-speed track environments, this caliper delivers exceptional stopping power and thermal stability, enhancing safety and performance.

Features:

• Differential bore pistons: Compensate for mechanical loading and temperature variations to reduce pad taper wear

• Thermlock® pistons in ST models: Provide up to 25% reduction in heat transfer from pads, lowering caliper and fluid temperatures

• Forged aluminum construction: Offers strength and durability with reduced weight for improved vehicle handling

• Suitable for high-temperature applications: Ideal for sustained hard braking on dirt, asphalt, rally, off-road, and road course racing

• Versatile design: Compatible with a range of motorsport and off-road vehicles for reliable performance

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
Clearance Item: t