WHILE DRIVING 30-35 MPH I TOOK NOTICE TO VEHICLE SLOWING DOWN IN FRONT OF ME. I APPLIED MY BRAKES AND PEDAL WENT TO FLOOR CAUSING ME TO REAR END VEHICLE. UPON IMPACT AIR BAGS DID NOT DEPLOY. TRUCK WAS TAKEN TO DEALERSHIP OF PURCHASE, STILL SITS THERE TODAY. THIRD OCCASION OF BRAKES GOING TO FLOOR, FIRST OCCASION OF AIR BAGS NOT DEPLOYING.*AK