DRIVING TO PHOENIX FROM TUCSON ON I-10 AT APPROXIMATELY 65MPH, TRAFFIC AHEAD CAME TO A STOP. THERE WAS A LOT OF DISTANCE BETWEEN THE CAR AHEAD AND OURSELVES, BUT WHEN WE HIT THE BRAKES ABRUPTLY, THE BRAKES APPLIED THEN FAILED WITH PEDAL GOING TO THE FLOOR. RELEASED THE PEDAL AND REAPPLIED AGAIN AND THE BRAKES AGAIN STARTED TO SLOW THE CAR THEN AGAIN FAILED AND RELEASED. WE HAD NO PATH TO THE SIDE OF THE ROAD TO AVOID IMPACT BECAUSE OTHER VEHICLES HAD PULLED TO THE SIDE, OR WERE IN THE OTHER LANE. WE IMPACTED THE VEHICLE STOPPED IN TRAFFIC AHEAD OF US WITH MINIMAL BRAKES. THE AZ DPS AND THE INSURANCE COMPANY WERE INFORMED OF THE FAILURE OF BRAKES, BUT A TICKET WAS STILL ISSUED. TO MY KNOWLEDGE THE VEHICLE BRAKES OR COMPUTER HAS YET TO BE CHECKED AS THE FUSION WAS CONSIDERED A TOTAL LOSS; THIS VEHICLE HAD ONLY 65,000 MILES ON IT, AND IN EXCELLENT CONDITION. THERE WERE THREE OF US IN THE FUSION AND THE AIRBAGS WORKED FLAWLESSLY, WE ALL WALKED AWAY. ALL OCCUPANTS OF THE OTHER VEHICLES WERE WELL AND WALKING AROUND FOR TWO HOURS UNTIL ONE WAS TALKED INTO AN AMBULANCE RIDE BY A PARAMEDIC TECH.