Just a wild guess, but if you are trying to test the electric brakes, and you don't have a controller; what if you first drove a few feet normally, stopped, then pulled the safety pin out of the emergency activator? Then, drive a few feet, and see if you feel any resistance that was not there before. That seems like it would indicate if they activate.
Granted, a low-budget way to test them, and it requires the battery to be charged, but in a pinch, this should show if the brakes activate electronically, wouldn't it?
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