DRIVING APPROXIMATELY 45MPH AND ATTEMPTING TO CHANGE LANES, GOT INTO RIGHT LANE AND TOUCHED BRAKES LIGHTLY TO STEER CAR STRAIGHT, STEERING LOCKED UP, COULDN'T STEER LEFT OR RIGHT, STEERING STUCK IN SLANT POSITION. PUMPING BRAKES AND THE BRAKES WERE NOT WORKING. CAR RAN INTO GUARDRAIL AND FLIPPED THREE TIMES. AIR BAG DEPLOYED. *AK