> accelerometers are dirt cheap these days, anyway,
That's true, but the vehicle is subject to accelerations that do not indicate
braking activity. Using an accelerometer to measure how hard the brakes are
applied is like trying to judge whether the sun is up by whether you can read
in your front room.
It also takes time for the brakes to take effect, and more time to read the
accelerometer and filter out vibration and whatnot. Yeah, sure, it might be
only a dozen milliseconds, but that can be the difference between breaking
someone's knees and not touching them.
-- Randall
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