ON MONDAY JAN, 27, 2020, I WAS INVOLVED IN THE ACCIDENT WITH MY 2013 TOYOTA PRIUS I WAS DRIVING ON A FREEWAY WITH REGULAR TRAFFIC. THE CAR IN FRONT OF ME SUDDENLY CAME TO A STOP. I IMMEDIATELY SLAMMED ON MY BRAKES VERY HARD. I HAD PLENTY OF SAFE DISTANCE BETWEEN TWO CARS. I ENDED UP RUNNING INTO THE REAR END OF FRONT CAR WITHOUT ANY NOTICEABLE SLOWDOWN. THE BRAKES DID NOT COME ON. THERE WAS NOT ANY FEELING OF GRABBING OR TIRE MAKING ANY SCREECHING NOISE. ALSO I DID NOT SEE ANY TIRE MARKS ON ROAD. ALL OF THE AIR BAGS WERE DEPLOYED AND THERE WAS A FRONTAL IMPACT. I ALSO DID NOT FEEL MY SEAT BELT TIGHTENING UP.THE BRAKES WERE NEVER FELT LIKE BEING EXERTING AT ALL. THE CAR WAS BADLY DAMAGED IN FRONT.