I am new to this forum but have found plenty of useful info on it without being a registered member and decided to register and see if i can solve a problem with my 2002 f250 sd 4x4. When I apply the brakes at highway speed my truck jumps up and down as if the brake rotors are warped but I have replaced all 4 rotors with no improvement. Any suggestions would be appreciated.

 

This could be wrong, but it wouldn't be the first time new rotors were bad.

 

Is the truck jumping, or is it shaking the steering wheel when braking? In other words, do you feel it in your butt or hands? Did you replace the pads when the rotors were replaced? If not, the pads might be worn enough to keep form applying equal pressure on all of the braking surface.