WHILE TRAVELING NORTH ON INTERSTATE 95 IN THE MIDDLE LANE AT APPROXIMATELY 60MPH AFTER SWITCHING INTO LEFT LANE SAW BRAKE LIGHTS AHEAD AND STEPPED ON BRAKE PEDAL. HEARD SLIGHT POP SOUND, BRAKE PEDAL WENT IMMEDIATELY TO THE FLOOR. CAR DID NOT STOP OR SLOW DOWN. SWERVED TO LEFT TO AVOID DIRECTLY HITTING CAR IN FRONT OF ME BUT HIT JERSEY WALL AND THE CAR. MY CAR KEPT GOING ANOTHER COUPLE HUNDRED YARDS BEFORE IT FINALLY STOPPED. CAR WAS TOTALED.WITHOUT FUNCTIONING BRAKES ADAPTIVE CRUISE CONTROL OR FORWARD COLLISION BRAKING WERE USELESS.