小丸子 asked in 科學其他:科學 · 1 decade ago

braking systems

1. what are the risks and benefits of anti-lock brakes?

2. does the increased cost of ABS provide a significant improvement in

brake safety? explain.

3. describe how drum (rear) brakes work.

4. describe how disk (front) brakes work.

2 Answers

Rating
  • Anonymous
    1 decade ago
    Favorite Answer

    1. what are the risks and benefits of anti-lock brakes?

    a)

    risk of anti-lock braking system (ABS):

    ABS brakes are the subject of some widely cited experiments in support of risk compensation theory, which support the view that drivers adapt to the safety benefit of ABS by driving more aggressively.

    The two major examples are from Munich and Oslo. In both cases taxi drivers in mixed fleets were found to exhibit greater risk-taking behaviour when driving cars equipped with ABS, with the result that collision rates between ABS and non ABS cars were not significantly different.

    Disadvantages of the system include increased braking distances under certain conditions and the creation of a "false sense of security" among drivers who do not understand the operation and limitations of ABS.

    A June 1999 NHTSA study found that ABS increased stopping distances on loose gravel by an average of 22 percent.

    b)

    benefits of anti-lock braking system (ABS):

    A 2003 Australian study[2] by Monash University Accident Research Centre found that ABS:

    Reduced the risk of multiple vehicle crashes by 18 percent.

    Reduced the risk of run-off-road crashes by 35 percent.

    On high-traction surfaces such as bitumen, or concrete many (though not all) ABS-equipped cars are able to attain braking distances better (i.e. shorter) than those that would be easily possible without the benefit of ABS.

    According to the NHTSA,

    "ABS works with your regular braking system by automatically pumping them. In vehicles not equipped with ABS, the driver has to manually pump the brakes to prevent wheel lockup. In vehicles equipped with ABS, your foot should remain firmly planted on the brake pedal, while ABS pumps the brakes for you so you can concentrate on steering to safety."

    2007-11-25 01:15:20 補充:

    2. does the increased cost of ABS provide a significant improvement in

    brake safety? explain.

    A 2003 Australian study[2] by Monash University Accident Research Centre found that ABS:

    Reduced the risk of multiple vehicle crashes by 18 percent.

    Reduced the risk of run-off-road crashes by 35 percent.

    2007-11-25 01:16:07 補充:

    3. describe how drum (rear) brakes work.

    A drum brake is a brake in which the friction is caused by a set of shoes or pads that press against the inner surface of a rotating drum. The drum is connected to a rotating wheel.

    2007-11-25 01:17:10 補充:

    4.

    A brake disc, usually made of cast iron or ceramic, is connected to the wheel or the axle.

    2007-11-25 01:17:52 補充:

    4.

    (continued)

    2007-11-26 13:29:11 補充:

    4.

    To stop the wheel, friction material in the form of brake pads (mounted in a device called a brake caliper) is forced mechanically, hydraulically, pneumatically or electromagnetically against both sides of the disc. Friction causes the disc and attached wheel to slow or stop.

    Source(s): Myself, Myself, Myself, Myself, Myself
  • Anonymous
    5 years ago

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