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