I just installed the Russell Brake Line kit for the 2004 F-150. I should have looked under the vehicle before ordering as the Russell kit comes with 3 brake lines. Your 2004 F-150 has 5 brake lines, 3 in the back and 2 in the front. So the Russell kit is a little shy of 2 brake lines. If your going to order a brake line kit for your 2004 + F-150 you might what to check how many lines they include with their kit's.

Edited to include more info: The rear has a rubber line for each disc and a single rubber line to a junction block that feeds both wheels.