100 % BRAKE FAILURE. 45 MPH,MODERATE TRAFFIC, 6:30PM THURSDAY MAY 7TH 2015, DRY PAVEMENT AND APPROACHING TRAFFIC THAT WHICH MADE AN ABRUPT STOP AHEAD. STEPPED ON BRAKE PEDAL, PEDAL FLUTTERED AS IF ANTI LOCKING BRAKE ACTIVITY WAS BE ACTIVATED. CAR CONTINUED TO FREE WHEEL FORWARD, I STEPPED HARDER ON BRAKE PEDAL AND PEDAL BEGAN PUSHING BACK TO ME. THE HARDER I PUSHED THE BRAKE PEDAL THE MORE IT PUSHED BACK (THERE WAS NO BRAKING ACTION).THE VEHICLE FAILED TO STOP , AND HAD ENOUGH DISTANCE TO STOP (I HAD A MINIMUM FOLLOWING DISTANCE OF TWO CAR SPACES) BUT BRAKES FAILED TO DO SO WHICH CAUSED ME TO CRASH INTO THE VEHICLE IN FRONT OF ME. I HAVE OWNED MANY CARS SUCH AS DODGE CHARGER 2006 SXT/CHEVY MALIBU 2009 TO NAME A FEW AND NEVER HAD THIS PROBLEM WHEN APPLYING THE BRAKES. I'M THE FIRST OWNER OF THIS CAR AND THIS IS THE FIRST HYUNDAI I HAVE EVER BOUGHT.