I was driving 20 mph straight down a flat residental street. A loud dash alarm sounded in my 2014 Hyundai sonada hybrid. The dash displayed "hybrid system warning, safely stop and do not drive". below the warning a yellow caution triangle displayed. I attempted to give the vehicle gas, so I could pull to the side of the road, but the engine acted like it had no power. A blinking green "ready" light was displayed. The eco guide display was moving up and down from the top to bottom. I took my foot off the gas pedal and began braking. The brakes felt mushy and the vehicle was not stopping. Within a few seconds the vehicle shook and was the engine was revving up and down but like it was out of gear. After approximately 10-15 seconds, I lost the power steering and the it was almost impossible to turn the steering wheel. I again tried braking but the brakes just felt mushy and were not stopping the vehicle. I continued coasting down the road and eventually used the emergency brake to stop the vehicle. Once the vehicle was stopped I shut it off and attempted to started the vehicle again. The green "ready" light displayed on the dash as well as the warning lights. The vehicle would turn on but not start again. I put the vehicle in neutral and had several people push me to the curbside. The brakes were very mushy and almost non-existent. I again used the emergency brake to stop it. I notified my local Hyundai dealer and advised I would be towing the vehicle to them. I had just came off the freeway and had this happened a few minutes earlier, I would not have been able to get to the shoulder of the freeway. I believe this issue could have caused serious injury or death. It was literally terrifying to lose control of the vehicle the way this occurred. There was no prior warning of an issue and not enough time to react once the warning symbol was displayed.

- Corona, CA, USA

While vehicle in motion, car just stop oversudan with a spoken message: " hybrid cells vehicle is in danger. Car will stop"and after this messgae, car stalls with no control on the breaks and steringwheel.

- Lithia, FL, USA

El carro tryna cuando voy de reversa Y cuando estoy an stop el carro tiembla Y los brakes ya SE los cambie Y siempre me hace ruido..

- Las Vegas, NV, USA

When the brakes are applied a little more rapidly or harder than normal there is a short grumble noise. This noise has no relationship to car speed as it will make this same noise if the car isn't moving or at any speed. The brakes feel and operate normally with the exception of the noise they make. I have told two different service departments and been told this noise is normal on all the Sonata hybrid cars. In the two years and 19,000 miles the noise remains the same, no less or more. Even if the car isn't on pushing on the brake peddle it will make the noise three or four times. The car has done this since new.

- Miramar Beach, FL, USA

I purchased sky blue 2014 Hyundai Sonata hybrid limited on August 31st, 2014. I drove the car for approximately two weeks, during this time I noticed and felt when I braked the car did not stop immediately, there was a delayed effect. At this time the break light illuminated. I checked the manual which indicated the car cannot be driven in this state and immediately took the car in for a checkup and service to dealership on September 19th, 2014 so that the illuminated break light could be checked. The technician spent five days on the car and discovered low brake fluid level on a brand new vehicle with 637 miles on the odometer. The cause reason is: Loose fitting. " low brake fluid level on a brand new vehicle with 637 miles" I had a further service on the vehicle at dealership on December 27th 2014 for having 3500 miles on the odometer. I requested a detailed brake check due to the earlier issue but they assured me it had been made correction. On January 6th 2015 I had just picked up my son from preschool and was headed to mcdonalds to buy my son lunch. My speed was 30 mph in a 55 mph speed zone. I remembered very vividly applying the brakes; the car just did not stop and hit the car in front of me. The brakes were applied with sufficient time and severity but the vehicle did not react or stop. My feeling is that the brake light incident was the precursor to an allegedly defective braking system which could be an inherent defect allegedly.

- Tustin, CA, USA