Materials of Brake Pads
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Transcript of Materials of Brake Pads
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7/28/2019 Materials of Brake Pads
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By Phillip Holifield and Nick Weil
SRJC, Engr 45, Fall 2009 Semester
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Disk brakes
convert kineticenergy from
the car intothermal energyby friction
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The brake fluid compresses the piston insidethe brake caliper applying pressure to thebrake pads
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Connected to the
axel rotating at
the same speed asthe wheel
Generally made outof steel
Commonly slottedor drilled for extraheat dissipation
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Fixed in the brake
caliper
Various compoundsof materials are used
Wear over time andmust be replaced
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Increase pad and rotor life
Reduce brake noise
Cooling to prevent heat fade Maximize braking force
Federal Safety Requirements
Environmental Impact
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Passenger Cars:
Low noise and wear
Trucks and SUVs: Heavier weight requires better braking
High Performance Cars: Need maximum braking and cooling
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Asbestos
Semi-Metallic
Non-Asbestos Organics Low Steel
Carbon
Exact composition of each manufacturers
pads is a closely guarded secret
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Widely used in early disk brake applications
Good for absorbing and dissipating heat
Average stopping power Asbestos is legally regulate due to its
carcinogenic properties
No longer used due to health risks
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Low to medium coefficient of friction ~ 0.28 0.38 Relatively high mu variation (temperature, duty cycle) Good fade characteristics Poor wear at low temps.,
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Typically contain nonferrous metals,
inorganic and organic fibers, abrasives,lubricants and property modifiers such asglass, rubber, kevlar and carbon
Typically used in high performance cars
Also referred to as ceramics
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Low to medium-high coefficient of friction ~ 0.33
0.40. Excellent wear at lower temps. < 200C. Good for wheel dust. Relatively poor wear under heavy duty conditions
and at higher friction levels. Good noise & roughness characteristics Can have morning effectiveness noise squealing
noise on first couple of brake applies in themorning More expensive.
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Typically contain ferrous and nonferrous
metals, inorganic and organic fibers,aggressive abrasives, lots of carbonaceousand sulfide lubricants
Replacing semi-metallic as the standard forpassenger cars
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Higher coefficient of friction levels ~ 0.38
0.50
Good pedal feel and braking confidence
Good fade and high speed performance
High pad/rotor wear
Good for high speed wear
Lots of wheel dust Inferior noise and life.
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Composite materials
reinforced withcarbon fibers
Used for both padsand rotors
Used in Formula 1and other race cars
Major manufacturers
include Hitco,Brembo and CarbonIndustries
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Text: http://en.wikipedia.org/wiki/Brake_pads http://en.wikipedia.org/wiki/Disk_brake http://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-
brake.htm www.suscon.org/bpp/pdfs/OEBrakePads.pdf http://www.performancefriction.com/pages/pad_type.htm http://www.f1technical.net/articles/2
Images: http://stmarysjin.org.uk/hsw/gif/disc-brake3.jpg http://www.akebonobrakes.com/oem/brake_products/images/3d_explo
ded_caliper.gif
https://www.nzad.co.nz/store/images/standard%20brake%20rotor%20(Small).jpg
http://www.good-win-racing.com/miata/images/items/GWR-078.jpg
http://en.wikipedia.org/wiki/Brake_padshttp://en.wikipedia.org/wiki/Disk_brakehttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://www.suscon.org/bpp/pdfs/OEBrakePads.pdfhttp://www.performancefriction.com/pages/pad_type.htmhttp://www.f1technical.net/articles/2http://stmarysjin.org.uk/hsw/gif/disc-brake3.jpghttp://www.akebonobrakes.com/oem/brake_products/images/3d_exploded_caliper.gifhttp://www.akebonobrakes.com/oem/brake_products/images/3d_exploded_caliper.gifhttps://www.nzad.co.nz/store/images/standard%20brake%20rotor%20(Small).jpghttps://www.nzad.co.nz/store/images/standard%20brake%20rotor%20(Small).jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttp://www.good-win-racing.com/miata/images/items/GWR-078.jpghttps://www.nzad.co.nz/store/images/standard%20brake%20rotor%20(Small).jpghttps://www.nzad.co.nz/store/images/standard%20brake%20rotor%20(Small).jpghttp://www.akebonobrakes.com/oem/brake_products/images/3d_exploded_caliper.gifhttp://www.akebonobrakes.com/oem/brake_products/images/3d_exploded_caliper.gifhttp://stmarysjin.org.uk/hsw/gif/disc-brake3.jpghttp://stmarysjin.org.uk/hsw/gif/disc-brake3.jpghttp://stmarysjin.org.uk/hsw/gif/disc-brake3.jpghttp://www.f1technical.net/articles/2http://www.performancefriction.com/pages/pad_type.htmhttp://www.suscon.org/bpp/pdfs/OEBrakePads.pdfhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htmhttp://en.wikipedia.org/wiki/Disk_brakehttp://en.wikipedia.org/wiki/Brake_pads