manufactures could easily do regen braking on cars.. its not really complicated.. hard for the home-brewer to make yeah, but so is a internal combustion engine.. and regen breaking seems ideal for all the abs computer controlled braking and traction controls out there. actually a hybrid with wheel motors seem the best way, you get power and regen at the wheel on each wheel and each can totally be controlled independently.. it would almost ultimate 4 wheel limited slip.
Not to mention .. you would most likely never need break pads ever!! the only breakpads I can see is parking break pads..
Also thing of how much room is consumed by drive axles etc in a car.
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