A month ago I bought a 2008 Prius. About a week ago, I started noticing the BRAKE light - which is only supposed to be on when the parking brake is engaged - would randomly turn on while I was driving and stay that way for five or ten minutes, then go away. A few days later, I was driving towards a red light when suddenly the BRAKE light came on again, along with three other warning lights - brake system, ABS, and VSC, which are all in a row on the panel. At the same time, it suddenly felt like my brakes had stopped working. I would press but it resisted hard and barely slowed down. I managed to come to stop just before the light. Afterwards, I had no choice but to keep driving, even though the brakes were barely effective, and gas pedal felt sluggish, and I thought I felt extra heat through the vents - almost as if I was driving with the parking break on. Since then, this has happened another dozen or so times, coming on randomly, staying for a random time (five minutes or twenty minutes), then disappearing. Turning the car off and back on again doesn't seem to effect it - the one time I tried while it was experiencing the problem, it came back on with the problem. Anyone heard of anything like this? I took it to a mechanic this morning, but they had no luck figuring it out - couldn't get it to happen for them, and the computer reported no stored errors.