My 2012 Model S (134k miles) popped up a message telling me that the parking brake had suddenly engaged while I was driving to work, luckily at only 20 mph in the neighborhood. (I did not press/hold the P button.) A few seconds later, as I was still deciding what to do with this information, I heard a loud crunch and bang. When I pulled over to look, my passenger rear brake rotor had shattered and crumpled, punching holes in the rim and tire and ripping off the calipers and part of the frame. I had to take it to a different Tesla service center than usual, and this new one barely communicated with me, wouldn't tell me what was going on, and was way off on their time and price estimates, ultimately charging me double what they initially quoted. I'm disappointed given the excellent service I had at a previous SC. This happened 7 months after I last had the car/brakes inspected. Since they wouldn't tell me anything, do any of you have any idea what happened here? Thanks.