FORD IS RECALLING 605,684 MY 2005-2006 F-150 AND LINCOLN MARK LT VEHICLES EQUIPPED WITH 5.4L 3-VALVE ENGINES. THE BRAKE BOOSTER VACUUM SUPPLY HOSE ATTACHED TO THE INTAKE MANIFOLD FITTING MAY SWELL OVER TIME AND LOSE RETENTION FORCE. THIS CONDITION COULD ALLOW THE HOSE TO BECOME DETACHED FROM THE FITTING DURING AN INTAKE MANIFOLD BACKFIRE. SHOULD THE HOSE DETACH FROM THE INTAKE MANIFOLD, SEVERAL BRAKE APPLICATIONS WITH POWER ASSIST WILL BE AVAILABLE BEFORE THE VACUUM RESERVE IS DEPLETED.