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  See all Brakes products
Wilwood Forged Superlite Internal 4 Brake Caliper R/H - 120-11329
Wilwood Forged Superlite Internal 4 Brake Caliper R/H - 120-11329 - Image 2
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.

These new FSLI4 and FSLI4/ST models use the latest innovation to the Superlite family of calipers. They have been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes, along with any potential problems that could arise from a damaged tube. The transfer tube has been replaced with two additional bleed screw assemblies which allow this group of right and left hand oriented differential piston bore calipers to be mounted in either a leading or trailing position.

The most noteworthy feature of all the FSLI caliper models is the exceptional strength and reduced weight of the forging. With assembled weights just at 4.4 pounds, the caliper body design in itself is a product of computer generated solid modeling and stress analysis technology. Each caliper features closed end bridges with a radial transition down to the main body and piston bore housings. The elimination of machined steps and sharp shoulders in this critical critical area provides a measurable increase in overall body strength and resistance to deflection under load. Every FSL body is stress-flow forged from a premium grade aluminum alloy billet. Stress-flow forging realigns the metal's internal grain structure to flow within the contour of the caliper body. This process eliminates the stresses and interruptions to the internal grain structure that occur when machining a straight block billet.

Features:
  • Caliper Type: 4 Piston
  • 5.18" Piston Area
  • 1.88/1.75" Pistons, 1.25" Disc
  • Rotor Diameter: 13.06"
  • Stainless Steel Piston Type
  • Anodized
Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

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Who is Wilwood?

Willwood Engineering Inc. was formed back in 1977 by Bill Wood. The company is known for manufacturing a high-performance disc brake system. 

Throughout the years, the company has continuously improved itself, along with the ever-changing advancement in-vehicle technology. 

Today, the company had extended its wheel designs to supply brake components for various vehicles, including agricultural equipment, utility vehicles, motorcycles, four-wheelers, military vehicles, and even snowmobiles.

A Brake for Every Need

Wilwood has an extensive inventory of brakes parts for various vehicles. With over hundreds of brake calipers, master cylinder, and rotor designs, not to mention the tons of brackets, fitting, brake lines, and valves, it has the right kit for every vehicle application you can think of.

Engineered to Perfection

The company entails the most advanced technology and software in designing and manufacturing its products. They use a finite element analysis and multiple testing procedure such as a dynamic and cycle test that helps them replicate real-world conditions and adjust their design accordingly, making the necessary correction even before they manufacture the actual product

Using only the finest materials available, they can create a product that meets its clientele's expectation whether it's for street use or for race application.

Wilwood has also been ISO Certified, making it compliant to all mandated processing procedures set by the regulatory board.

Purchase Wilwood Products at Vivid Racing

Your brakes are the most important component of your car. It is easy to make your car fast, but you have to make sure you can equally make it stop as well. 

Wilwood has the right product for you. With safety and quality at its core, they are the product you can surely trust. Visit Vivid Racing and check the list of parts that would fit your specific needs.

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Sale price None
Wholesale price $225.06
Shipping Weight: 5.20
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Product Added At Tuesday 26 January, 2021
Product Modified At Wednesday 28 May, 2025
Imported By ETLOverride
Last Edited By kathi@vividracing.com
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Emissions Info
Carb Approved -
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Epa Status N/A
Prop65 Unknown
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Vendor Inv Cost Retail Jobber MAP Core Updated
Wilwood Engineering $190.73 $286.10 $264.90 $264.90 ? 2025-05-28 14:50:03


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