BREAK FAILED TO STOP THE CAR. BREAK PEDAL WAS DEPRESSED ALL THE WAYTO THE FLOOR. JUST DIDN'T COME TO FULL STOP. HAPPENED 2 DAYS IN A ROW. THE LATTER INCIDENT HIT THE CAR IN FRONT. IT'S A REAL HAZARD ON THE ROAD. NOW THE CAR IS BEING SERVICED AND LOANER CAR IS BEING PROVIDED BY THE DEALER. CARSON NISSAN IN CALIFORNIA.