Is anyone familiar with how data acquisition systems acquire percent brake usage? For example: http://www.youtube.com/watch?v=cCE8...QDd5ScAMng&index=1&feature=plpp_video#t=0m15s shows brake usage in a linear display. Do they use accelerometers, and if so how does it distinguish from engine braking and braking via rotors. Would it be possible to add a pressure transducer inline with the brake lines, or attach a force transducer to the brake cable? Thanks.