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All 2003 Ford vehicles were shipped with vacuum line routing diagrams printed on a sticker, which should be affixed inside your engine compartment. It is important that you use THAT diagram, as vacuum routing varies widely from vehicle to vehicle depending upon options and regional configuration.
if you have rear drum brakes a return spring that pulls the brake shoes back to the unapplied position or a hold down spring may have broken which is now causing the brake shoes on that wheel to be applied causing the drag not all people bought there cars and trucks with 4 wheel disc brakes it was cheaper and didn't matter to them they just wanted lower $$$ check it out if this is the case you'll have to turn the adjuster star wheel inside the drum all the way in to get the drum off because the brake is applied it will be a pain but you'll get it you must use a brake spoon or a flat blade screw driver and a smaller one to lift up the return spring arm from the star wheel if this one is broken you will have to try to pry the drum off then buy a spring kit from auto parts and some brake tools if you don't have them already and change all the springs one by one so you don't get confused but also try to get a rear brake shoe diagram in case everything has fallen apart inside and you remove the drum and find a whole bunch of parts on the floor in front of you the diagram will give you the aid that you'll need if you have never done this before most of all inspect that wheel cylinder for leaking fluid if this is so replace it now good luck LATER MAN!
This is a drum style brake. If this is the case what you are going to need is a pair of spring pliers, or drum brake tools. it makes the retaining springs and the hold down springs a lot easier to manage. and also helps with removing and replacing the longer springs. Your local parts store should have one and they go for any where from $12-$30 USD.