WENT TO STOP HIT THE BRAKE PEDDLE AND THE CAR DID NOT SLOW DOWN, I PUMPED THE BRAKES THEN HIT THEM AGAIN STILL THE CAR DID NOT SLOW DOWN, I IMPACTED THE REAR OF A TRUCK, A FIRE STARTED UNDER HOOD IN FRONT OF THE DRIVER'S SIDE AT THE WINDSHIELD AREA, THE STEERING WHEEL AIR BAG DIDN'T DEPLOY NOR DID THE SEAT BELT LOCK, CAUSING ME TO HIT THE STEERING WHEEL WITH MY CHEST. CAR WAS TRAVELING APROX. 35 MPH.