I have a 2005 Prius that has an extra option of stability control. The car does as others are reporting in the 2010 models. If I hit a bump or icy patch while applying the brake or as I am applying the brake the car lurches forward and the brake does not engage. Thus far I am able to hit harder and hold the brake a second time and the car then behaves as expected and stops.

- Framingham, MA, USA

I have a 2005 Toyota Prius with about 80K miles. When braking, the car jerked forward into an intersection almost hitting another car. There were no special weather conditions to report when this happened and I was driving at a normal speed before braking. This has happened about three times.

- Annapolis, MD, USA

Our 2005 Toyota Prius surges when we are braking, coming to a stop and pass over a mound or pothole, that is, any irregularity in the road's surface. This has happened many times, and luckily, no collision has yet occurred.

- Portland, ME, USA

My 2005 Toyota Prius, exhibits the same symptoms of acceleration, skidding effect when hitting a bump and braking, as today's report of the 2010 Prius doing the same thing. I thought it has been the anti-skidding mechanism all these years, but the description of this malady in the 2010 Prius sounds like my 2005.

- Yonkers, NY, USA

'05 Toyota Prius. Chronic failure of antilock brakes and of vehicle stability control. Toyota dealers repair shop claims that this is to be fixed at my expense. Seems to me that important safety defects should be repaired for free. How many like-complaints have you rec'd.?

- Nr, NY, USA

Toyota Prius 2005 failing brake system- for the second time (the first incident was on 27-Jun-2008) my brakes were not functioning properly. The first time the Toyota dealership "recalibrated the computer" and could not tell me why is failed or that it would not happen again. The second occasion, yesterday, I actually rearended another car. No damage other than a complaint of possible whiplash and a warning that I may hear from him in a few days. The dealer just called me this afternoon to tell me that now they are "replacing the computer." Does this happen to Prius's. it was very frightening and really makes me feel quite unsafe to drive my car which presented no major problems until the present braking issue. The anti skid light comes on a fair amount and my tires slip. I have been on line and there seems to be a number of complaints similar to mine and in different model years.

- Berkeley, CA, USA

Spontaneous failure of regenerative and power braking systems on Prius, resulting in extremely difficult braking and long stopping distance; the 2 occurrences happened at a speed of less than 30mph so I was able to safely come to a stop, but at a higher speed it could have been disastrous. There was no warning, and in one case, the brakes were not even being applied at the time, if I remember correctly. The problem, brake, ABS, and ps warning lights illuminate, and there is an audible alarm. The dealer did not perform any repairs after the original incident but after a second incident they are now replacing the ABS electronic control unit and several other electronic components.

- Mahopac, NY, USA

I was involved in a low-speed accident in which the brakes in my car (2005 Toyota Prius) did not slow or stop the car and caused me to run into the back of another vehicle. No one was injured, the airbags did not deploy and there was no damage to the vehicle my car collided with. The exterior damage to my car was estimated approximately $6700. Soon after, I was notified by the insurance company that my car was totaled due to damage sustained to the hybrid system. I requested that the event data recorder be downloaded to determine if there had been a failure in the brake system. My insurance company refused and Toyota appears to have ignored my request. I also find it disturbing and curious that the front end and hence the hybrid system was destroyed beyond repair in an accident so minor that the police would not even give it a report number.

- Wheaton, MD, USA