2006 F250 hard shuddering when braking
 

I've done some searching and checked what was mentioned should be checked but it has not turned up anything so thought I would post before I bring the truck in.

When braking the truck shakes terribly, enough to toss a drink out of the cup holder almost. Sometimes there is a slight feeling in the peddle but not always. The shudder feels like it is timed with each revolution of the wheels.

It developed from a perfectly stopping truck over the course of maybe a month. I don't drive the truck that much either.

Things I have checked:

1, all u-joints, they all look and feel good, no play or slop in them
2, air pressure in all tires, even rotated them, no effect
3, brakes-front and back all looked good but I went ahead and replaced front pads and rotors, cleaned caliper pins, zero effect.
4, shudder exists whether in gear and slowing or in neutral, 2wd and 4wd

What the heck else is there to check? My first thought was, front brakes/warped rotors, but after pulling them apart there was so much life left on the rotors and pads and replacing all that with new did nothing! Could bad back brakes cause this much of a shudder? They look fine as well.

Any help is much appreciated.

Yes, it could be the back brakes.

Agree re bad back brakes. Started doing it on my 2006 F350 a few months ago. This is mainly a plow truck, so I drive it maybe once a week in the summer just to make sure everything works. I thought the brakes had developed a rusted spot from sitting, but I couldn't get rid of it by hard braking, etc. It felt like the brake pedal was oscillating an inch every revolution. New rear brakes and it's perfectly smooth now .

This is exactly what a couple of my trucks did when the rear slide pins on the brakes were froze up. I'd bet the farm on rear brakes.

Wow thought that with the front doing the bulk of the braking that rear brakes going back could never cause this kind of shuddering! They look perfect but for peace of mind and doing it myself I'll grab some pads and rotors, clean and grease the slide pins and see if that doesn't take care of the problems, thanks for the advice - will update after that, hopefully be able to close the thread!

Thought I would close this thread up. It was the back left brake. The only thing I noticed was that there were two spots on the rotor that looked hazed, otherwise the rotors were normal, wear was normal, pads had normal wear and no hung slide pins. I did one side at a time and drove it to see which side it was. Funny that something so hard to see was causing such a horrible shudder! Stops like a dream now, thank you everyone for the advice. Now if only it wasn't a 6.0L! :-X04