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i am unable to find that which is most common brakes used as braking system in USA, as i am studying the braking system of vehicles in USA.

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    I'm voting to close this question as off-topic because it's not really about maintenance. It's the sort of thing someone may study to get a historical vs modern view (as older cars had drum brakes and newer ones tend to have disc brakes) but it would require a lot of assumptions (eg is this cars registered as road legal, farm vehicles etc) - so I just think it's too broad for here. – Rory Alsop Mar 21 '16 at 13:46
  • @RoryAlsop Agree with you. – race fever Mar 21 '16 at 16:19

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