Got a warning the other day that "the parking brake did not engage and vehicle may roll". In fact, I got another message "parking brake fault" on the upper dash. As it turns out, the brake was actually locked up. It did free up a few times and I started driving it, but got the warning again and it seemed that the parking brake was locking up while I was driving. Called Tesla and they wanted me to drive it to the SC. I called again today and had them tow it to the SC. Hope to know soon what the deal was. I have a 2015 P85D.