The contact owns a 2012 Toyota Prius. The contact stated while driving at various speeds, there was an abnormal humming and buzzing sound detected. There were no warning lights illuminated. The vehicle was taken to the local dealer where it was diagnosed that the ABS brake and brake booster pump needed to be replaced. The manufacturer was contacted and referred her to the NHTSA Hotline for assistance. The failure mileage was approximately 119,000. The VIN was not available.

- Anaheim, CA, USA

The contact's mother owns a 2012 Toyota Prius. The contact stated while driving at various speeds and depressing the brake pedal, the brakes made an abnormal sound. There were no warning lights illuminated. Additionally, the contact stated while the vehicle was parked, the ABS, the brakes, the electronic parking brake, and traction control system warning lights were illuminated. The vehicle was taken to the dealer, where it was diagnosed that the brake booster assembly, the brake booster pump, and the brake master cylinder needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that they could not assist as an unknown Customer Satisfaction Program had expired. The failure mileage was approximately 125,000.

- Pensacola, FL, USA

The contact owns a 2012 Toyota Prius. The contact stated while driving approximately 40 MPH, the brakes became inoperable. The ABS and traction control warning lights were illuminated. The vehicle was taken to an unknown local dealer where it was diagnosed that the brake booster and brake pump assembly needed to be replaced. The vehicle was not repaired. The manufacturer was contacted but no additional assistance was provided. The failure mileage was approximately 335,000.

- Nashville, TN, USA

The contact owns a 2012 Toyota Prius. The contact stated that while driving at an undisclosed speed, the brake warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the brake master cylinder and brake booster needed to be replaced; however, the dealer informed the contact that the repair was not covered under warranty. The vehicle was not repaired. The contact stated that the failure recurred while driving and the vehicle hesitated while the brake pedal was depressed. The contact slammed on the brake pedal and the vehicle came to a complete stop. The vehicle was towed to the residence. The manufacturer was not made aware of the failure. The failure mileage was 185,519.

- West Palm Beach, FL, USA

The brake doen't work when I was driving out of the highway. I pressed hard of the brake and cannot stop the car. And I crushed into a big truck. The car crushed once with the truck and the momentum made the car to hit the traffic light pole again. Terrible.

- Minnetonka, MN, USA

1. when vehicle transitioned from battery to motor, significant impact resulted 2. brake pedal traveled to floor, dash warning light came on [vehicle towed] 3. attempting to leave dealers lot, brake pedal traveled to floor. Technician witnessed. Updated 01/15/13

- Middleboro, MA, USA

Sunday Dec. 11th: Pulling out of Chicago garage, car makes odd rotational noise. The sound seems to go away after about a block or so of driving. The dealership is closed and I am booked up with clients, so I continue to test and see if temperature or environment effect the noise. The noise appears to only happen on a 'cold start' but all other factors do not seem to show an impressive change. Dec. 15th: I call Toyota corporate and file a complaint, then per their direction, call the dealer and make an appointment to have the noise problem fixed. Jan. 13th: After several calls to corporate, and having taken the car in three times to the dealership (midtown Toyota- Chicago), I have been informed by one of the service employees that Toyota is having a problem with many of these models. They think it is a back brake issue, perhaps defective part(s). As both Toyota & the dealership are not officially telling me this. This is what I know, they have been lying to me as a consumer and me and other customers are driving a car with a potential safety problem. I do not feel safe driving this car.

- Chicago, IL, USA