I noticed the vibration about 6 months ago and checked my u joints. No extra play there. It has since gotten worse all the while trying to figure out what is wrong. I feel the vibration everywhere. The old rule of feeling it in the steering wheel is front end, seat is rear end doesn't help as it is the entire truck. I have been trying to deal with this myself and diagnose the problem but I am getting nowhere. Also within the last couple days I will occasionally feel a shudder in the truck like it's dying and then it's back fine.

Had a wheel bearing go out right front and replaced it. (Well after vibration started)
Began to wonder if other side was a problem and checked it. It was good. No excessive play in the half shafts. Both sets of drive shaft u-joints seem fine too. I just don't know what is going on. Any help is greatly appreciated. I really hope this stands out to someone with a better idea than myself

 

Take the truck in and have the tires rotated and re-balanced and see if that doesn't help.

 

Ah sorry I'd left that off of the list. These are new tires that I've already had rotated and balanced twice so far in hopes that it would help. And the problem existed before the new tires as well. Thank you though haze.

 

My truck (Feels like front end) Vibration only when Braking; 2008, 45k, no tire wear, mileage consistent/15mpg, steering solid, and no other signs of a problem.

Logic covers; calipers (slides lubed), pads, bearings, tires, linkage.
EPAS, rack and pinion assembly, dirty wheel sensor are another concern.

2008 Ford F-150 parking brake TSB (Bulletin 08-14-18)
Bulletin Date: Mar. 1, 2008
Component: Parking brake.
Bulletin Summary: Intermittent vehicle vibration--parking brake disengagement concerns.
Vehicles covered in this TSB: 2004 Ford F-150, 2005 Ford F-150, 2006 Ford F-150, 2007 Ford F-150, 2008 Ford F-150, 2006 Lincoln Mark, 2007 Lincoln Mark, 2008 Lincoln Mark.