Tried to drive my daughter to school and myself to work this morning in my 2012 Model S with 80,000+ miles and the parking brake would not release. I think it's just the right rear brake, but may have been more than that initially, but the other(s) broke free. I made multiple attempts to back the car up and pull it forward to try to get the frozen parking brake to release, because that has worked in the past over the years when damp weather caused the pad to stick to the disc brake, particularly in the winter. We have had torrential rains and flooding here and I drove through some fairly deep puddles (maybe 6" max) on Saturday during the rains, then parked the car around 3pm Saturday and did not drive it again until today (Monday)...so it sat for ~40 hours without being driven. Called service, they had me power down for 2 minutes, then power up and do a reset with the scroll wheels, but that didn't do anything...I really don't think it's an electronics issue, I think the brake pad is physically stuck to the disk from the moisture. Having it towed 180 miles up to the KC Service center this morning, suspect it will be a quick fix, but still a pain in the rear to be without the car for a couple of days.