My 2004 F-150 now has a bad shimmy in the front end. It doesn't so much feel like a side-to-side shimmy. It's more like and up and down shimmy. But it only happens when I'm hitting the brakes. Usually between 55 to 35 MPH it'll shimmy the front end with the brakes engaged.
I recently had the wheels (rims and tires) rotated and electronically balanced thinking it was a misbalanced tire. But the problem is still there. I had the brakes redone by Brake Check about a year ago. They had to resurface the rotors and replace the brake pads. They seemed to have done a good job at the time, and that was about a year ago now.
Any suggestions would be greatly appreciated.