If the battery was drained significantly < 30% it could be permanently damaged. It will take a charge , but not hold up well under load. When you get back home, I would have it load tested at an auto parts store. As for the brake damage, the brakes being activated for an extended period of time at full power could damage the magnets. This will occur no matter of the unit is parked or moving. You should check them at first opportunity.
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