2005 Ford 500 shakes when braking

My Ford 500 has been starting to shake when braking.
At first I thought it was the front pads and rotors, so I replaced the entire front w/new pads, and rotors.

Didn't fix the problem.

Then, just this wkend I changed my rear pads. I checked the runout for both back rotors, and they were both within .005" so I know for a fact, they aren't warped. I knocked any rust off the perimeter.

All calipers are working fine (front and back), as far as I can tell.

Steering wheel shakes alittle, not much. The shaking is much more noticeable through out the car as opposed to the steering wheel. And i'm not feeling a pulse through the brake pedal.

I'm stumped. I've tried everything I can think off. I just wanted to get some other opinions before I take it to a garage and pay just to be told whats wrong.

Generally a problem ( on the front of your car ) will be felt in the steering wheel as it shakes , vibrates , etc. so I suspect your problem is at the rear of your car . Have you had your tires checked ( balance as well as a possible slipped belt inside the tire ) ? Might have a bent wheel , a loose u - joint , loose shock , just a multitude of possibilities . Check all the bolts and nuts under the car and make sure all are tight and you haven't had something come loose and fall off . It is frustrating , I know ! Good luck !