I have a 2005 Prius with 132K miles (bought it new). A couple of years ago all the brake warning lights came on. I parked the car for a couple of hours. When I restarted it, no warning lights. No problems since (30K miles). My mechanic scanned the codes and found that there was some sort of problem with the solenoid in the left, front brake.
On PriusChat I see quite a few problems with Prius brake systems. I suspect most are due to the complexity of the software that deals with anti-lock, anti-skid, regenerative braking, etc. Some people claim that they lose braking completely, which is obviously very dangerous.
Do the same problems appear in non-hybrid cars? Although I’ve been happy with my Prius, since non-hybrid cars are getting in the range of 40 MPG, I’m thinking that my next car should be less complex. I do miss shifting gears for myself, which is becoming a lost art. Safety is my main concern.
BTW, I’m a retired software engineer who has designed many software-controlled systems. So it may seem odd that I don’t completely trust them, but I know that all software of this complexity has bugs in it. Mechanical things wear out. Software either works or doesn’t.