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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