Brake failure / Unintended Acceleration / Unknown cause Driving at approx 25mph on urban street (road in good condition no potholes, ramps, etc) I began to slowly brake as I approached a red traffic light. Instead of braking, the car began to accelerate quickly. I pressed the brake pedal again - no response. Pressed down hard for a third time which executed an emergency stop. This all happened within 1 or 2 secs. There were no injuries or involvement of other cars on this occasion. However, had I been any closer to the car in front, I believe I would have rear-ended it. Had this occurred a few moments later, at the busy junction 400m ahead, it could have been fatal. I am absolutely sure it was not driver error. I was not distracted, drive regularly, and have been a confident and safe driver for over 30yrs. I have never experienced this in a car before, and in fact wasn't aware that it could happen until I researched it on this site. No warning lights or indicators came on. The car ran normally for the remaining 2 miles back home. I didn't think anything of it before, but prior to this incident (in our 5 yrs ownership) there were approx. 5 instances when the engine would "roar" as if it wanted to accelerate but didn't when I was breaking or slowing down on a highway. Also, there were perhaps 3 instances when the car felt as though it was "running away" i.e. a slight acceleration - for no obvious reason. As neither of these represented safety issues, I assumed the car was just a bit old and these issues would be addressed as part of any service. Now I wonder if they are related to the sudden acceleration. The car is currently having a "health checks" run, but nothing has been found. I am reluctant to drive this vehicle if neither my dealer or Toyota can discern the problem. Overall we have been happy with this car and its performance, but this is an unacceptable "anomaly" as far as safety is concerned. Vehicle available for inspection.

- Mclean, VA, USA

While braking the front wheel rolled over a sunken sewer cover causing temporary braking failure and a sliding sensation.

- Mokena, IL, USA

A los 3 meses de comprado fue en marzo 2017 dio la primera vez el problema en todo el sistema de frenos lo repare Y al mismo tiempo exacto finales de junio 2017 volvio a dar el mismo problema el concesionario no quizo responder ni porque tenia garantia lleve el carro Y como no SE podia manejar por los frenos no servian me enviaron el carro en grua a mi casa no lo uso desde agosto Y lo estoy pagando Y por logica ya sucedio dos veces el carro no sirve Y ya no SE a quien pedir ayuda porque el carro aunque SE repare su problema SE volvera a repetir porque el carro no sirve Y me E encontrado un comunicado donde dicen que los prius muchos han resultado con el mismo problema de los frenos. Toyata dijo en unos de mis reclamos que era mi culpa Y ni en lo mas absoluto nl ES mi culpa soy duea de 3 carros mas Y mas viejos Y con ninguno he tenido problemas de ninguna indole espero puedan ayudarme porque mi vida Y la de mi hija corren peligro al manejar ese vehiculo. Adjunto foto de cuando del dealer mandaron mi carro porque no ES nada seguro manejarlo.😠

- Dana Point, CA, USA