I WAS DOING 30 MPH ON THE EXPRESSWAY DURING RUSH HOUR. THE CAR IN FRONT OF ME SLAMMED ON HIS BRAKES, AS I SLAMMED ON MY BRAKES I REALIZED I WAS NOT STOPPING. I SWEARVED TO THE LEFT LAND AND HIT THE MEDIAN WALL THAT DIVIDES NORTH AND SOUTH BOUND TRAFFIC. MY AIR BAG DID NOT INFLATE, I HIT THE WALL DIRECTLY ON THE LEFT HIGHLIGHT AND MY BRAKES FAILED. THIS IS THE SECOND TIME IN THE PAST YEAR MY BRAKES HAVE FAILED. WHENEVER THEY ARE LOOKED AT AFTERWARDS, NOTHING IS FOUND. I WOULD LIKE TO KNOW IF THERE IS SOMETHING I CAN DO ABOUT THE BRAKES AND THE AIR BAG. THANK YOUR.