Brake Pad Part No: 15C-4419K

High-Temperature Racing Pads

Pad#: D52
Compound: PolyMatrix C
Prod #: 15C-4419K
Price: $158.31
PolyMatrix C
PolyMatrix C Brake Pads Plate Type
Pad Dimensions
Thickness(in) .52 / .58
Area(in²) 10
Volume(in³) 3.9
Bedded N
UPC Number
UPC 889545036251
Dust & Noise Ratings
Dust Production Rating
Pad Noise Rating
WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov
WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov

PolyMatrix C Compound

Pad Characteristics

  • Medium to medium high friction compound with soft middle temperature response and a gradual rise to a flat torque curve as temperatures increase.
  • Long wear rate for severe-duty, sustained high-temperature braking.
  • Reduced friction alternative to B.

Pad Applications

  • Race ONLY compound commonly used to reduce bias against A, B, or H compounds when additional hydraulic adjustments are not available.
  • Use on any lightweight vehicle, including dirt applications, with high mechanical advantage brakes to prevent wheel lock-up in marginal traction conditions.

Rotor Material

PolyMatrix C Performance Stats PolyMatrix C Performance Stats
PolyMatrix C Friction Coefficient and Temperature Values PolyMatrix C 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 #D52

D52 Dual Piston Floater
Caliper Dimensions
Piston Count 2
Piston Area Range (in²) 2.46 - 6.28
Pad Area Range (in²) 10
Pad Volume Range (in³) 3.9
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 12.19

D52 Dual Piston Floater Calipers

The D52 caliper is a direct bolt-on 2 piston replacement for the factory original single calipers on many 1968-96 GM Passenger Vehicles and Trucks. Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put and end to the rust, bore pitting, and seal failures that plague the OE caliper design. D52 calipers provide low-maintenance performance and a huge weight savings with high temperature reliability for the street and track. View GM D52 Dual Piston Calipers
D52-R Single Piston Floater
Caliper Dimensions
Piston Count 1
Piston Area Range (in²) 4.45 - 5.94
Pad Area Range (in²) 10
Pad Volume Range (in³) 3.9
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 12.19

D52-R Single Piston Floater Calipers

Wilwood's newest pure heavy-duty race caliper, the D52-R starts with a lightweight 4.3-pound forged aluminum Type III hard anodized body with a stainless steel piston. Choose a width of 2.75” or 2.38” pistons, and rotor widths of 0.81”, 1.04” and 1.28" thick in common 11.75”, or 12.19”, and up to 12.50” diameters. Caliper fluid inlet port centered directly behind the piston eliminates any interference with slide pins. Lower deflection rate and higher volumetric efficiency than all the competitions’ heavier cast models, D52-R calipers also use standard D52 pads available in a range of compounds for every application. Caliper mounting uses the original GM stock height and offset. D52-R Caliper, also known as D52R Caliper, is the pinnacle design for OEM replacement racing calipers. View D52-R Single Piston Floater Calipers
GM III Single Piston Floater
Caliper Dimensions
Piston Count 1
Piston Area Range (in²) 4.45 - 5.94
Pad Area Range (in²) 10
Pad Volume Range (in³) 3.9
Max Rotor Widths (in) 1.04
Max Rotor Diameters (in) 11.75

GM III Single Piston Floater Calipers

Wilwood’s GMIII caliper represents the latest refinements in caliper design and manufacturing through solid modeling and stress simulation programs. The result is the most rigid, highest torque, lightweight aluminum caliper with weights starting at 3.36 pounds. Requires use of hardened Wilwood slide pins (sold separately), request part no. 230-0619 (slide pin kit) contains 4 slide pins, enough for two calipers View GM Single Piston Calipers
GM III Single Piston Floater
Caliper Dimensions
Piston Count 1
Piston Area Range (in²) 4.45 - 5.94
Pad Area Range (in²) 10
Pad Volume Range (in³) 3.9
Max Rotor Widths (in) 1.25
Max Rotor Diameters (in) 11.75

GM III Single Piston Floater Calipers

Wilwood’s GMIII caliper represents the latest refinements in caliper design and manufacturing through solid modeling and stress simulation programs. The result is the most rigid, highest torque, lightweight aluminum caliper with weights starting at 3.36 pounds. Requires use of hardened Wilwood slide pins (sold separately), request part no. 230-0619 (slide pin kit) contains 4 slide pins, enough for two calipers View GM Single Piston Calipers

 
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Version: 3.05 June 23, 2023