2010 Prius - Brake light with rapid beeping.
Car came out of the car wash and when I turned it on it started to beep rapidly and brake light came on. I moved the car but brakes were not working. I had to get the car towed. Any one has any clue what happened. first time I ever encountered the problem.
(I too re-learned recently via frozen door-latching-cams that a carwash anywhere near arctic weather is asking for trouble...)