This will be a long post, but I wanted to
share my experience that I've had with my 2011 F250.
A brief preview of some issues that I've had with my pickup before I got it fixed. For a few months, I noticed when I would apply the brakes, it would pull to the left slightly. I figured I had a stuck caliper or bad line, but I wanted to wait and see if anything changed before fixing it, but I did buy some caliper seal kits just in case. About a month later, my truck got a shimmy in it on certain roads. Figured it was either the road, or bad steering components. I started looking at everything up front, and all joints where tight. Couldn't find anything wrong, so I was thinking shocks and a steering stabilizer was in order. I rotated tires a few weeks later, and noticed my left rear brake pads where noticeably worn lower than all the other pads. The stuck caliper idea came to mind, but for the left rear, not the front or rear right like I was thinking. I ordered rear pads and was planning on putting the caliper kits in when I did them. Then the advance track light and abs light went off a few days later. I didn't know how to diagnosis that since my scan tool didn't work for abs codes. I took my pickup into the dealer and asked them to fix the abs issue. I still wanted to do brakes on my own.
They found the problem, a bad spot in the wire of the right front wheel speed sensor. They put a new one in and I took it home.
after driving it a few days, i noticed that it no longer pulls to the left when i brake, and the shimmy went away on the rough roads. A week later, I noticed a small bump in mileage after filling up, and it has stayed.
A simple speed sensor has cured more problems than a simple abs/advance track light. I guess it was always thinking the right front tire was "skidding" when it wasn't, causing the left rear brake to constantly apply, and it had to get bad enough to set the light off.
Thought it was an interesting experience to share. Hope it may help someone down the road.