Brake Pad Part No: 150-9421K


Street Performance / Racing Pads

Pad#: D52
Compound: BP-20
Prod #: 150-9421K
Price: $81.78
Wilwood Brake Pad Plate #D52 Wilwood Brake Pad Plate #D52 Zoom Image
BP-20
BP-20 Brake Pads and Box
Picture shown is for illustrative purposes only
Pad Dimensions
Thickness(in) .52 / .58
Area(in²) 10
Volume(in³) 3.9
Bedded N
UPC Number
UPC 889545033557
Dust & Noise Ratings
Dust Production Rating Low to Moderate
Pad Noise Rating Low to Moderate
WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov
WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov
NSF Int’l LeafMark certified friction formulation.Compliant with SAE J661 industry standards.

BP-20 Compound

Pad Characteristics

  • Medium friction pad, highest effective temperature range in medium temperature pad group
  • Smooth engagement, friction rises with increased temperature
  • Medium wear rate at high temperature
  • High performance street and track compound with increased friction and a wider temperature range over BP-10
  • Baseline pad for track oriented street cars

Pad Applications

  • Street use okay
  • Street
  • Autocross
  • Track day
  • Drag race
  • Medium braking dirt and pavement race

Rotor Material

  • Steel
  • Iron
BP-20 Performance Stats BP-20 Performance Stats Zoom Image
BP-20 Friction Coefficient and Temperature Values BP-20 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: 2.86 October 12, 2021