The contact owns a 2010 Toyota Prius. The contact stated that whenever braking to drive over any uneven road surface, the braking distance was increased. The contact stated that the vehicle also seemed to push forward as if another vehicle had abruptly crashed into the rear of the contact's vehicle. The vehicle was not inspected. The failure mileage was 36,000 and the current mileage was 38,216. The consumer stated the vehicle was inspected by Toyota. Toyota found no recalls or failures with the vehicle. The consumer stated to the service employee the vehicle lunged, all loose items flew back in the seats and the consumer was thrusted against the seat. The service employee replied that the consumer was mistaken. Updated 09/20/2012

- Knoxville, TN, USA

The unintended acceleration accident happened on 7/18/2012, ~6:20 pm at company's parking lot. I backed my 2010 Prius slowly. Then I saw a car coming on my way. But before I took any action, this Prius suddenly started accelerating, it went wildly, and turned more than 360 degree backward in the parking lot in just a few seconds. Since the car parked between a building and a slop, from the front mirror, first, I saw the building wall and glasses, then I saw the slope, then I saw a car parked close to my car: No! don't hit that car! that is the last thing I remember. Because of the fast turning of the car and because I was so terribly scared, I lost conscious after that until the Prius hit the truck and bounced back and stopped by itself. After a few seconds, I woke up and realized: I am still alive. I got off the car and saw Prius passed the two curbs and hit the truck. The two tires on the driver side got flat because they passed the curb very fast. I was so scared that I couldn't recall of anything for a few days until weekend. Why did the car lose control" one may argue that I stepped on the accelerator. This could happen to new drivers, but not to me because I have been driving for so many years and always a good driver. Many times I saw a car on my way when I was backing, I always stopped right away. And I was healthy in a normal day in normal mode, alert as usual. Why would I step on accelerator when backing? even if I mis-stepped on the accelerator, I can always switch to brake right away. But I could"T do anything about the car on the day. It was out of control completely. After I lost conscious, my hands were off the steering wheel and my foot didn't step on anything, the car didn't slow down but still moved fast and passed two curbs easily. Such a manipulation can only be done when the car is in acceleration, and by itself. Please investigate it asap!

- San Diego, CA, USA

2010 Prius brake failure. I was able to slow down the car by repeated pumping on the brakes. Fortunately, managed to crawl to a nearby Toyota dealer by using the pumping technique and have my foot on the emergency foot brake just in case. Toyota said I need to replace the master cylinder with actuator. Total cost parts/labor $4100. I am upset because my family or others could have been seriously hurt if I panicked and not pumped on the brake to slow the vehicle down. This is a serious hazard which should be known as I have seen other similar complains lodge online.

- Sunnyvale, CA, USA

I applied my brakes approaching a traffic light and hit a small pot hole and the entire vehicle jerked forward even though the brakes were applied and never taken off the pedal. I had to then press down harder on the brake pedal to come to a complete stop. I have observed this type of behavior when the road changes surfaces and is lower than the previous surface and dips in the road. This is all observed while only braking at low speeds less than 40 mph. Every time this behavior is observed there is a loud bang, I am not completely sure if this is from switching surfaces or hit pot holes or dips in the road.

- Houston, TX, USA

The contact owns a 2010 Toyota Prius. While driving approximately 40 mph, the contact was able to abnormally depress the brake pedal into the floorboard. The ABS warning, traction control warning and the emergency brake warning lights illuminated on the instrument panel. After continually depressing the brake pedal, the vehicle came to a stop. The failure recurred four different times. The vehicle was taken to the dealer for diagnostic testing. The technician advised the contact that the brake power booster would have to be replaced but did not guarantee that the booster was the actual cause of the failure. The vehicle was not repaired. The approximate failure mileage was 55,000.

- Cedar Grove, NJ, USA