Brake Pad Part No: 15B-5939K-B

High-Temperature Racing Pads

Pad#: 7420
Compound: PolyMatrix B
Prod #: 15B-5939K-B
Price: $295.98
PolyMatrix B
PolyMatrix B Brake Pads and Box
Picture shown is for illustrative purposes only
Pad Dimensions
Thickness(in) .80
Area(in²) 8.2
Volume(in³) 4.9
Bedded Y
UPC Number
UPC 889545036152
Dust & Noise Ratings
Dust Production Rating N-A
Pad Noise Rating N-A
WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov
WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov

PolyMatrix B Compound

Pad Characteristics

  • Medium-high friction pad with good initial response
  • Good low temperature response
  • Medium-low wear rate during sustained high heat braking
  • High heat fade resistance

Pad Applications

  • Racing only - Not for street use
  • Road course
  • Oval pavement
  • Dirt all classes
  • Off road

Rotor Material

  • Steel
  • Iron
PolyMatrix B Performance Stats PolyMatrix B Performance Stats Zoom Image
PolyMatrix B Friction Coefficient and Temperature Values PolyMatrix B Friction Coefficient and Temperature Values Zoom Image

The above friction data (μ) was recorded through braking cycles from 95 mph to 40 mph at a 0.5g deceleration. Snubs were consecutively done until rotor temperature reached 1300°F. This graph represents average data and is for general trend visualisations only comparing Wilwood pads. Chart data should not be used in comparison with other manufacturer's data. Test conditions, variables, and environment can affect test results.

Temperature range and overall friction value are the primary considerations for pad selection. The pads must maintain the proper amount of friction for stopping power within the temperatures that will be realized on the track. Overall wear rate must also be considered. For most asphalt and road race applications, compounds in the high-temperature range over 1000°F are usually necessary. Dirt track, drag race, and street performance applications usually operate at temperatures between 500° and 1000°F. Keep in mind that these are general ranges and not absolute values. Many factors and unforeseen influences can affect brake temperatures. The best indicator for pad selection will always be on-track performance. If pad fade (friction loss) due to overheating occurs, improved cooling, a heavier rotor, or a higher temperature range pad may become necessary.

Wilwood Compatible Caliper(s) for Pad #7420

Billet Superlite 4 Lug Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 4 Lug Mount Calipers

The billet SL4 caliper incorporates Wilwood's latest technology in a conventional 3.50" centered lug mount design, with weights starting at 4.94 pounds. This caliper series has been structurally designed for high clamping efficiency and low deflection in a body width compatible with all wide 5 and 5 x 5 style hubs. It is a direct replacement for all other Superlite style calipers. View Billet Superlite 4 Lug Mount Calipers
Billet Superlite 4 Lug Mount-ST
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 4 Lug Mount-ST Calipers

The billet SL4/ST caliper incorporates Wilwood's latest technology in a conventional 3.50" centered lug mount design, with weights starting at 4.94 pounds. This caliper series has been structurally designed for high clamping efficiency and low deflection in a body width compatible with all wide 5 and 5 x 5 style hubs. It is a direct replacement for all other Superlite style calipers. View Billet Superlite 4 Lug Mount Calipers
Billet Superlite 4R Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 4.12 - 4.84
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 4R Radial Mount Calipers

The Billet SL4R series adds the versatility and convenience of radial mounting to this widely popular caliper group. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. The key to the superior performance of the SL4R comes from the extremely durable and efficient body design. Starting at 4.84 pounds it is the product of computer generated solid modeling and FEA stress analysis technology. Full length stiffening ribs and a reinforced radial transition from the piston bore housings to the closed end bridges has produced the strongest SL caliper bodies ever built. View Billet Superlite 4R Radial Mount Calipers
Billet Superlite 4R Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 2.22 - 2.49
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 13.06

Billet Superlite 4R Radial Mount Calipers

This specially configured Superlite SL4R narrow body caliper features an increased bridge radius to allow proper pad alignment and bridge clearance for use with 13.00" to 14.00" diameter rotors. A special body design is used with 16mm pads to provide the narrowest possible profile for tight clearance applications. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. View Billet Superlite 4R Radial Mount Calipers
Billet Superlite 4R Radial Mount-ST
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 4.84
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 4R Radial Mount-ST Calipers

The Billet SL4R series adds the versatility and convenience of radial mounting to this widely popular caliper group. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. The key to the superior performance of the SL4R comes from the extremely durable and efficient body design. Starting at 4.84 pounds it is the product of computer generated solid modeling and FEA stress analysis technology. Full length stiffening ribs and a reinforced radial transition from the piston bore housings to the closed end bridges has produced the strongest SL caliper bodies ever built. View Billet Superlite 4R Radial Mount Calipers
Billet Superlite 6
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 Calipers

The billet SL6 series integrates "Big Brake" style and Wilwood's latest technology into the traditional 3.50" centered lug mount Superlite caliper category. Each caliper is precision CNC machined from high strength billet into three specialized configurations that cover a broad range of competition and sports driving applications. View Billet Superlite 6 Lug Mount Calipers
Billet Superlite 6 -W5 Radial Mount
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 -W5 Radial Mount Calipers

The billet SL6R series adds the versatility and convenience of radial mounting to this widely popular caliper group. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. These calipers integrate "Big Brake" style with Wilwood's latest technology to generate big stopping power in extreme environments over a broad range of vehicle applications. View Billet Superlite 6R Radial Mount Calipers
Billet Superlite 6 Radial Mount
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 Radial Mount Calipers

The billet SL6R series adds the versatility and convenience of radial mounting to this widely popular caliper group. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. These calipers integrate "Big Brake" style with Wilwood's latest technology to generate big stopping power in extreme environments over a broad range of vehicle applications. View Billet Superlite 6R Radial Mount Calipers
Billet Superlite 6 ST
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 ST Calipers

The billet SL6 series integrates "Big Brake" style and Wilwood's latest technology into the traditional 3.50" centered lug mount Superlite caliper category. Each caliper is precision CNC machined from high strength billet into three specialized configurations that cover a broad range of competition and sports driving applications. View Billet Superlite 6 Lug Mount Calipers
Billet Superlite 6 ST Radial Mount
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 ST Radial Mount Calipers

The billet SL6R series adds the versatility and convenience of radial mounting to this widely popular caliper group. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. These calipers integrate "Big Brake" style with Wilwood's latest technology to generate big stopping power in extreme environments over a broad range of vehicle applications. View Billet Superlite 6R Radial Mount Calipers
Billet Superlite 6 ST-W5
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 ST-W5 Calipers

The billet SL6 series integrates "Big Brake" style and Wilwood's latest technology into the traditional 3.50" centered lug mount Superlite caliper category. Each caliper is precision CNC machined from high strength billet into three specialized configurations that cover a broad range of competition and sports driving applications. View Billet Superlite 6 Lug Mount Calipers
Billet Superlite 6 ST-W5 Radial Mount
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6 ST-W5 Radial Mount Calipers

The billet SL6R series adds the versatility and convenience of radial mounting to this widely popular caliper group. Radial mounting simplifies adaptation and provides two planes of adjustment for accurate alignment over the disc. These calipers integrate "Big Brake" style with Wilwood's latest technology to generate big stopping power in extreme environments over a broad range of vehicle applications. View Billet Superlite 6R Radial Mount Calipers
Billet Superlite 6-W5
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Billet Superlite 6-W5 Calipers

The billet SL6 series integrates "Big Brake" style and Wilwood's latest technology into the traditional 3.50" centered lug mount Superlite caliper category. Each caliper is precision CNC machined from high strength billet into three specialized configurations that cover a broad range of competition and sports driving applications. View Billet Superlite 6 Lug Mount Calipers
Forged Superlite
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98 - 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Forged Superlite Calipers

The Superlite caliper series has set the standard for many years in short track, late model, modified and open wheel competition. It has also enjoyed prominence in a variety of road-race, off-road, rally and sport driving applications. Starting at 4.40 pounds, the Forged Billet Superlite (FSL) is the newest innovation to this series from Wilwood. New and adaptive technologies have been applied providing substantial improvements in strength, fluid volume displacement, and overall performance. View Forged Superlite Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 2.46
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 0.90
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

FSL4R/ST calipers provide performance advantages of Thermlock® pistons for ultimate heat protection. Thermlock® pistons used 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 Type III 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. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 4.84 - 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

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. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 2.46 - 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

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. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 4.84 - 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

The Superlite 4R caliper series is the benchmark in asphalt short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, rally and sport driving applications. The new FSL4R model series is the latest innovation to this Superlite family of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes. The transfer tube has been replaced with two additional bleed screw assemblies which allow symmetrical piston bore models to be mounted either right or left in a leading or trailing position. Differential bore models still require left hand and right hand orientation, but no leading or trailing configuration is necessary. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 2.46 - 4.12
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

The Superlite 4R caliper series is the benchmark in asphalt short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, rally and sport driving applications. The new FSL4R model series is the latest innovation to this Superlite family of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes. The transfer tube has been replaced with two additional bleed screw assemblies which allow symmetrical piston bore models to be mounted either right or left in a leading or trailing position. Differential bore models still require left hand and right hand orientation, but no leading or trailing configuration is necessary. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98 - 2.46
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

The Superlite 4R caliper series is the benchmark in asphalt short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, rally and sport driving applications. The new FSL4R model series is the latest innovation to this Superlite family of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes. The transfer tube has been replaced with two additional bleed screw assemblies which allow symmetrical piston bore models to be mounted either right or left in a leading or trailing position. Differential bore models still require left hand and right hand orientation, but no leading or trailing configuration is necessary. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial Mount
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 0.90
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial Mount Calipers

The Superlite 4R caliper series is the benchmark in asphalt short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, rally and sport driving applications. The new FSL4R model series is the latest innovation to this Superlite family of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes. The transfer tube has been replaced with two additional bleed screw assemblies which allow symmetrical piston bore models to be mounted either right or left in a leading or trailing position. Differential bore models still require left hand and right hand orientation, but no leading or trailing configuration is necessary. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial MT-Quick-Silver
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 0.90
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial MT-Quick-Silver Calipers

FSL4R/ST-QS 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-QS 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 Quick-Silver Nickel 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. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial MT-Quick-Silver
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 2.46 - 4.12
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial MT-Quick-Silver Calipers

FSL4R/ST-QS 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-QS 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 Quick-Silver Nickel 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. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial MT-Quick-Silver
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 4.84 - 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial MT-Quick-Silver Calipers

FSL4R/ST-QS 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-QS 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 Quick-Silver Nickel 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. View Forged Superlite 4R Radial Mount Calipers
Forged Superlite 4 Radial MT-Quick-Silver
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 4 Radial MT-Quick-Silver Calipers

FSL6R/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 ST caliper 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 either a Quick-Silver Nickel finish or Type III hard anodize, 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. View Forged Superlite 6R Radial Mount Calipers
Forged Superlite 6 Radial Mount
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 6 Radial Mount Calipers

FSL6R/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 ST caliper 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 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. View Forged Superlite 6R Radial Mount Calipers
Forged Superlite 6 Radial Mount
Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.35
Max Rotor Diameters (in) 14.00

Forged Superlite 6 Radial Mount Calipers

The Superlite 6R caliper series is the benchmark in asphalt short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, rally and sport driving applications. The new FSL6R model series is the latest innovation to this Superlite family of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes. The transfer tube has been replaced with two additional bleed screw assemblies which allow differential bore models to have a left hand and right hand orientation, but no leading or trailing configuration is required. View Forged Superlite 6R Radial Mount Calipers
Forged Superlite Internal
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98 - 4.80
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Forged Superlite Internal Calipers

The Superlite caliper series is the benchmark in short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, off-road, rally and sport driving applications. The new FSLI model series is the latest innovation to this Superlite family of calipers. It has 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 allows this group of symmetrical piston bore models to be mounted either right or left in a leading or trailing position. View Forged Superlite Internal Calipers
Forged Superlite Internal 4
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Forged Superlite Internal 4 Calipers

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. View Forged Superlite Internal Calipers
Forged Superlite Internal 4 ST
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Forged Superlite Internal 4 ST Calipers

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. View Forged Superlite Internal Calipers
Forged Superlite ST
Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 5.18
Pad Area Range (in²) 8.2
Pad Volume Range (in³) 4.9
Max Rotor Widths (in) 1.38
Max Rotor Diameters (in) 13.06

Forged Superlite ST Calipers

The Superlite caliper series has set the standard for many years in short track, late model, modified and open wheel competition. It has also enjoyed prominence in a variety of road-race, off-road, rally and sport driving applications. Starting at 4.40 pounds, the Forged Billet Superlite-ST (FSL-ST) is the newest innovation to this series from Wilwood. New and adaptive technologies have been applied providing substantial improvements in strength, fluid volume displacement, and overall performance. View Forged Superlite Calipers

 
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Version: 3.05 June 23, 2023