I have a 2006 F-150 FX4 5.4L. A copule days ago I was driving down the highway probably around 115 km when the truck starting vibrating getting worse the longer I kept going and after about 30 seconds I decided I to slow down because it felt like a tire was going flat. When I put the brakes on it vibrated really badly. I took my foot off the brake and the vibrating seemed to stop. So I stayed on the highway and continued to my destination, when I arrived about 15 mins later I decided to look around the truck and see if I could see anything. I could not see nything visually but I did get a bit of a burning smell at the left rear wheel and the wheel was significantly hotter than the right rear. Today I had to run to the store pulled out of my driveway and headed up the road about 1 min later going up a hill it surged twice just two short ones then seemed to go back to normal. Anyone have any ideas?

 

Could be a seizing caliper.

 

I was wondering if it could be the same thing, I also wonder if it could be that the parking brake shoes are to tight causing the rotor to get hot. I think I will take it to the dealer to have them look at it. I think for the truck the brake pedal does feel soft, my dad has a 1997 F-150 and the brake pedal in that is hard as a rock, this thing has a lot of pedal travel compared to that.

 

Took the wheels off the back this morning checked pads and rotors everything looked good. went to pull the rotors off both were stuck to the parking brake shoes. Finally got them off. Shoes were totally rusted and both adjusters were seized and would not move. Took everything apart going to get kits for both sides then put them back on. Hopefully it will be good to go then. Next job is to change the plugs. Yikes by the sounds of what everyone is telling me.

 

Sorry man but i gotta ask. Where are you from? Im asking because you used 115 km to tell how fast you were going and i have no idea how that is converted into MPH.

 

I am from Ontatio Canada and sorry that would be about 70 MPH.