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If the alternator is 50% efficient then you get twice as much braking for the same elctrical load. But to compare, for a 3500 lb car a quick stop, but no ABS, might be going from 60 mph to 0 in about 10 seconds (about 0.275 g). That can be done with a constant load of 77 hp - 4000 amps at 14 volts.
-mort
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