Trucks shakes when on highway and braking?

So I'm not sure what's going on.

My trucks shakes a lot when driving on the highway. It feels fine any other time. It also shakes really bad when I'm braking but not the whole time I'm applying the brakes. Not really sure what could cause this because I looked at my brakes and rotors and they seem fine.

Oh, also it won't coast. Like say I'm driving on the highway and I'm going down hill I can let off the gas and it will slow down pretty quick. I thought it was just the gears (even though it's an automatic) but it does the same when in neutral. Any ideas?

 

Sounds like a caliper is seized up on the front end. Have you checked your brake pads and rotors?

 

Are you smelling Hot Brakes ??

Seized Caliper or perhaps Bell cranks seized in the brackets

The shaking might be tire balance .

I had a weight fall off and it made a big difference

 

If a caliper is sticking he overheated the rotor and it warped that's possibly why it shakes when braking ~~OBT~~

 

check/rebuild the calipers, new rotors and have the tires balanced.

 

I actually just went and got my tires balanced and now it rides for the most part perfect one of them was off by 11 ounces and the other three were around 6 off

 

Oh and it also had one lug nut finger loose and another was cross threaded

 

So we're done here?

 

sounds like some one was messing with yer truck ? ~~OBT~~

 

Yeah I think so it's doing okay now

 

I hope not lol but I just bought it a couple days ago

 

I have vibrating when braking too, I just got 4 new tires from Costco not too long ago. There were bigger tires and I told them "just put on the stock tire sizes".

There's also this weird squeaking noise that only happens sometimes. It's coming front end. It sounds like the brakes, but it doesn't always happen. Sometimes I can hear it when I'm just driving along normally, or at freeway speeds.