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Or even really old school: an offset weight on a shaft that's free to rotate and activate a switching device in porportion to rotation. Brake controllers had this back in the '70s
Down side is it activates sometimes during non braking decel, but adding brake light requirements would tend to solve that.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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