I WENT TO STOP/BRAKE FOR SLOWING TRAFFIC ON INTERSTATE WHEN BRAKE PEDAL WENT ALL THE WAY TO THE FLOOR, TRUCK WOULD NOT STOP. TRUCK AFTER IMPACT STILL TRAVELED OVER 200 PLUS YARDS BEFORE COMING TO A ROLLING STOP. HOW CAN THE FOLLOW HAPPEN??? 'BRAKE PEDAL GOING ALL THE WAY DOWN TO THE FLOOR 'SUDDEN LOSS OF BRAKING EFFECTIVENESS 'COMPLETE FAILURE OF BRAKING FUNCTION