WHILE DRIVING 35 TO 40 THE CAR IN FRONT OF ME SUDDENLY STOPPED AND WHEN I BRAKED, THE CAR WOULD NOT STOP. THE ANTI-LOCK BRAKES NEVER ACTIVATED AND I SLID RIGHT INTO THE CAR IN FRONT ME. I HAD PLENTY OF ROOM TO STOP, BUT COULD NOT. IN ADDITION, ON IMPACT, THE BACK PASSENGER SEAT FLEW FORWARD. IT DID NOT STAY IN A LOCKED POSITION. I'M GLAD I DID NOT HAVE AN INFANT OR SMALL CHILD IN THE BACK SEAT. *TR