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Materials of Brake Pads

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Title: Materials of Brake Pads Author: Student Last modified by: Ernesto Gutierrez-Miravete Created Date: 12/7/2009 3:58:15 PM Document presentation format – PowerPoint PPT presentation

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Title: Materials of Brake Pads


1
Materials of Brake Pads
  • By Phillip Holifield and Nick Weil
  • SRJC, Engr 45, Fall 2009 Semester

2
How do disk brakes work?
  • Disk brakes convert kinetic energy from the car
    into thermal energy by friction

3
Brake Caliper
  • The brake fluid compresses the piston inside the
    brake caliper applying pressure to the brake pads

4
Brake Rotors
  • Connected to the axel rotating at the same
    speed as the wheel
  • Generally made out of steel
  • Commonly slotted or drilled for extra heat
    dissipation

5
Brake Pads
  • Fixed in the brake caliper
  • Various compounds of materials are used
  • Wear over time and must be replaced

6
Design Challenges
  • Increase pad and rotor life
  • Reduce brake noise
  • Cooling to prevent heat fade
  • Maximize braking force
  • Federal Safety Requirements
  • Environmental Impact

7
Design Challenges
  • Passenger Cars
  • Low noise and wear
  • Trucks and SUVs
  • Heavier weight requires better braking
  • High Performance Cars
  • Need maximum braking and cooling

8
Brake Pad Materials
  • Asbestos
  • Semi-Metallic
  • Non-Asbestos Organics
  • Low Steel
  • Carbon
  • Exact composition of each manufacturers pads is
    a closely guarded secret

9
(No Transcript)
10
Asbestos Pads
  • 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

11
Semi-Metallic Pads
  • Range from 30 to 65 metal and filler
  • Different pads use Steel, Iron, and Copper
  • Harder material is very durable and has excellent
    heat resistance
  • Creates more noise and dust
  • Used in most cars and SUVs

12
Semi-Metallic Pads
  • 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., lt100C
  • Excellent wear at temps. over 200C
  • Good wear under heavy loads
  • Poor wear at high speeds
  • Generally inferior Noise, Vibration Harshness
    compared to NAOs
  • Contains no copper
  • Low initial cost
  • High fluid temperatures can be an issue

13
Non-Abestos Organic Pads
  • Typically contain nonferrous metals, inorganic
    and organic fibers, abrasives, lubricants and
    property modifiers such as glass, rubber, kevlar
    and carbon
  • Typically used in high performance cars
  • Also referred to as ceramics

14
Non-Abestos Organic Pads
  • Low to medium-high coefficient of friction 0.33
    0.40.
  • Excellent wear at lower temps. lt 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 the
    morning
  • More expensive.

15
Low Steel Pads
  • Typically contain ferrous and nonferrous metals,
    inorganic and organic fibers, aggressive
    abrasives, lots of carbonaceous and sulfide
    lubricants
  • Replacing semi-metallic as the standard for
    passenger cars

16
Low Steel Pads
  • 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.

17
Carbon Pads
  • Composite materials reinforced with carbon fibers
  • Used for both pads and rotors
  • Used in Formula 1 and other race cars
  • Major manufacturers include Hitco, Brembo and
    Carbon Industries

18
Carbon Pads
  • Light weight rotors weigh less than 1kg
  • High coefficient of friction - can decelerate an
    F1 car at over 5G
  • Operating temperature is around 800-1000C
  • Extremely expensive to produce

19
References
  • Text
  • http//en.wikipedia.org/wiki/Brake_pads
  • http//en.wikipedia.org/wiki/Disk_brake
  • http//auto.howstuffworks.com/auto-parts/brakes/br
    ake-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/im
    ages/3d_exploded_caliper.gif
  • https//www.nzad.co.nz/store/images/standard20bra
    ke20rotor20(Small).jpg
  • http//www.good-win-racing.com/miata/images/items/
    GWR-078.jpg
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