Turkey Hunter

have a 2004 5.4l f150. Its started to shake/vibrate real bad when I hit my breaks so I figured it was bad rotors. So I took it to a local mechanic to get my rotors replaced and new brake pads if it needed them. So I picked it up this evening and he said that the rotors and brakes were fine. Could this be a bad wheel baring or do you guys think its bad rotors. Or could it be something else.
Thanks

TSmith

alignment maybe? my dads truck shook when you'd break and he got the front aligned when he put a leveling kit on it and it cleared it right up.