2011 Hyundai Genesis brakes problems

On 8/16/11, while driving down a couple of hills on my brakes, approaching a car & stop sign at an intersection a little over 2 blocks away, I pressed down harder on the brake pedal to come to a complete stop. The car, a new, 2011 hyundai genesis, would not stop. I continued to press harder and harder on the brake, but the car would not stop. It just continued at to move at the speed I was driving down the hill, approximately 15-20 MPH. As a result, the car rolled directly into the car sitting at the stop sign.

The brake pedal would become soft while driving and would travel to the floor with little to no stopping power. Several times both on city streets and freeways the vehicle became difficult to slow or stop and almost resulted in several collisions. The vehicle had been recalled and previously serviced with new brake fluid per NHTSA campaign 13v489000. At 59,000 miles I had alerted the hyundai service department about the brake failure. They were unable to reproduce the problem.