MY WIFE WAS TRAVELIING SOUTHBOUND ON IL TOLLWAY I94 WHEN SHE PROCEDED TO BRAKE FOR A TOLL PLAZA. SHE APPLIED HER BRAKES AND HAD NO RESPONSE. SHE BEGAN ATTEMPTING TO BRAKE ABOUT 500 FEET FROM THE PLAZA. THE ANTI-LOCK BRAKES NEVER RESPONDED AND TO HER RECOLLECTION THE BRAKES NEVER WENT ON. SHE HIT A CEMENT BARRIOR WHILE TRYING TO FIND A CLEAR LANE TO PASS THROUGH. THIS PROBLEM HAS BEEN INTERMITTANT THROUGHOUT THE OWNERSHIP OF THE CAR. WHEN I HAVE THE VEHICLE LOOKED AT, NO PROBLEMS ARE FOUND.