2010 Toyota Prius-while approaching stop light with brakes slightly engaged, left front tire struck a pot hole approximately 15" in diameter and two pavement layers deep. Vehicle brakes got soft and car accelerated briefly for less than one second. Braking then returned to normal feel and acceleration ceased.

- St Clairsville, OH, USA

S10 appropriate handling-letter from regarding Toyota problems

- Middleburg Heights, OH, USA

The contact owns a 2010 Toyota Prius hybrid. The contact was driving 30 mph when he pulled the cruise control lever up to increase the speed, the steering wheel would turn left and when he pulled the lever down to decrease speed, the steering wheel would turn to the right. He took the vehicle to the dealer who advised him to hold the steering wheel tight when increasing or decreasing the cruise control speed and it would not move. The contact was concerned that he had to hold the steering wheel tighter than normal at all times. He called the manufacturer and was instructed to take the vehicle back to the dealer. When he took the vehicle back to the dealer, they informed him that the failure could not be duplicated. The failure mileage was 5. the current mileage was approximately 7,000. Updated 05/24/10 the consumer was told to have a firm grip on the steering wheel when using the cruise control to adjust or set the speed of the vehicle. The consumer stated the steering was affected whenever he adjusted the cruise control lever mechanism. Updated 06/01/10.

- Toluca, IL, USA

2010 Toyota Prius. Consumer expresses discontent regarding innocent lives lost and regarding Toyota defects.

- Corona Del Mar, CA, USA

Two occurrences: Sudden loss of acceleration without any warning. First time dealership said it was a loose computer connection which they said they tightened and rebooted computer. Second occurence, they say they don't know what happened and have contacted Toyota headquarters for advice. Still waiting after 6 days. Concerned about this happening on a very busy freeway. We were on a highway that wasn't that busy and we were able to safely pull to the side of the road. Could be disastrous on a busy freeway where everyone is going bumper to bumper at 75 mph!!!

- Post Falls, ID, USA

True! gear problem! remember airbus flipping our of control when they came out with fly by wire? the joy stick gear is default to shift into neutral when normal push bring it in to reverse. No way to put it in neutral. I thought the same thing & was in denial until I realize that its impossible to put it into neutral when thing is speeding out of control. Don't take it lightly- I did bought a 2010 Prius just now & realize - U can't put it - in neutral. I was in denial. Also, ventilator fan suddenly accelerates when U try to switch the modes.

- Louisville, KY, USA

Letter from attorney general concerned about the 2010 Toyota Prius anti-lock brake issue the attorney general was very please that NHTSA is investigating the matter. The attorney general requested that NHTSA answer several questions. Updated 03/10/10

- Hartford, CT, USA

This is the breaking problem im having with my 2010 Prius: When I am stepping on the break, and also go over a small bump in the road, the car seems to accelerate for a moment and then goes back to breaking again.

- Newcastle, CA, USA

Brakes disengage momentarily when braking on a rough or rippled surface. It gives the feeling the vehicle is being accelerated. Uncontrolled travel distance can be lengthly. I have experienced four such instances.

- Easton, PA, USA

While braking and on uneven sufrace brakes feel like they have sropped working and then later catch, vehicle seems to actually speed up. It occures at lease 1+ a day depending on where I am driving and or weather conditiond. Speed dosn't always matter, as if coming off expressway and braking, speeds can be 55mph and it still happens. Luckily I have not hit any thing yet.

- Chicago, IL, USA

My 2010 Toyota Prius seems to lose braking power whenever I hit a bump or slick patch in the road. Not only do the brakes seem completely disengaged, but the car actually feels like it accelerates forward. I've adapted my driving, but only after I'd ended up in the middle of a couple of intersections because the car shot forward while I was ostensibly braking. Fortunately, I've not yet rear ended anyone.

- New Hope, MN, USA

I bought a 2010 Prius in August 2009. When I apply the brakes on a bumpy road there is a loss of breaking for a short time. It feels like a surge in acceleration before the brakes work again. I do not know if it is a safety issue but it is very disconcerting.

- Maywood, NJ, USA

While braking on roadway that has a manhole or a patch in the asphalt that is not exactly level with the rest of the asphalt, the tires feel like there is no traction and the car feels like it is hydroplaning. I have experienced this while driving on two specific roads and now I try to avoid the areas to prevent the feeling of having no control over the car. It feels like the car lurches forward and has no traction. This happens on dry roads. It is very frightening when it happens. I first noticed it when I first purchased the car in July and it has continued to happen.

- Cotati, CA, USA

I have owned a 2010 Toyota Prius for approximately six months. During that time I have experienced on several occasions (6-8 times) a feeling that the car is actually lurching forward while I am driving at low speeds over rough pavement and applying the brake. In my case the lurching of the car happens only when I am slowing down to make a turn. It is a frightening experience when you're applying pressure to the brake and your car feels as though it is about to take off. The sensation lasts for a second or two nevertheless it's still as I said frightening. When I first mentioned it to my local dealer the response was that it's the ABS brakes and it's normal.

- Manalapan, NJ, USA

1.I purchased this 2010 Prius in August 2010. I have experienced unanticipated acceleration two times since the last (initial) service. Once with my husband driving on route 17 and the other time while I was driving on a local road. 2.as I stated in my service paperwork when the car was first serviced, there is a problem with the brakes. They do not stop on uneven road surfaces, such as pot holes, bumps, etc. Your service department said that this is caused by the ABS and it is "normal". obviously there is still a problem. Please advise what will be done to correct this issue. 3.when start the engine first thing in the morning (or when the car has not been driven for a while) often, but not always, it makes a grinding noise when starting

- Mahwah, NJ, USA

I've been hearing in the news about the potential of a braking issue with the 2010 Toyota Prius. Just wanted to let you know that I definitely noticed this issue in my new Prius. Approximately once a month, when I'm braking over an uneven or slippery surface, especially if it is only one side of the car going over the slippery surface, while I'm braking, there is a moment lasting less than a second where it feels like the brakes disengage. (causes your heart to skip a beat when it happens.) I also noticed a separate quirk the other day that I want to pass on to you. I'm not sure if this was done deliberately by Toyota or whether this is a defect, however, I believe my speedometer is calibrated so that it reads a speed that is 2 mph faster than my actual speed. I noticed this when I went on a trip and used my wife's tom tom, which uses its gps signal to measure the speed of the car. The tom tom is usually spot on in my wife's Acura. In the Prius, it was indicating that my true speed was 2 mph less than what my speedometer indicated. I'm wondering if this wasn't somehow intentionally done by Toyota to get better perceived gas mileage by the driver. Having the car get over the 50 mpg threshold is a big marketing advantage for them. Getting over this threshold would be easier if the actual speed of the car was less than the perceived speed.

- Cincinnati, OH, USA

When applying the brakes over a bumpy or metallic surface, there is a uncomfortable delay until the brakes "kick in". this has been going on for some time.

- Scarsdale, NY, USA

I was driving on pleasant grove blvd in roseville ca with a speed of 44 mph. It was about 7:16 pm. On my right a saw a black cat on the curb ahead of my walking, trying to make it's way across pleasant grove blvd. I made an emergency stop (didn't have to come to a complete stop) not to hit the cat. I pushed the brake pedal with full force in order to stop in time. There was no one behind me at the time happily. However, I noticed that the ABS system didn't kick in and hence my brakes blocked shortly during the emergency stop. In la I had this happen twice to me that the ABS didn't kick in and my wheels block. It's easily repeatable by making a stop that requires a short distance to stop. Happily this is hardly ever necessary, but I don't feel safe doing it. I have driven two Toyota corollas, they never had this issue and always the ABS worked great. In the 2010 Toyota Prius, this doesn't work well. In addition to the braking issues on the highway, this is another problem with the Prius brake. It makes me feel insecure on the road with the Prius and I don't enjoy driving it due to these issues. It's just not safe!

- Roseville, CA, USA

The 2010 Toyota Prius that I have has very grabby brakes when backing up. This usually occurs when backing out of a parked position. It is a recurrent problem and can repeatedly jerk the car to a fast stop when backing up. Such quick jerking can make one lose control of the car.

- Jupiter, FL, USA

My 2010 Prius stops braking or accelerates when hitting a pothole or bump causing the car to stop later than anticipated. Almost hit a person in the cross walk.

- Irvine, CA, USA