Not sure if it did this before the wreck. But hit two deer head on. It’s a v-6 limited edition 2005. It will shake and shake more & harder the more you push the brakes. It doesn’t do this is you brake on a flat surface. So, I’m not sure what the problem is. It also sometimes rattles pretty loud under the hood if you idle for more than a few minutes. I’m not sure if that’s related to the wreck or shaking.
I recommend that you take tis to a good front end shop, you may have damaged a suspension component that a body shop would overlook. Don’t let them tell you its warped rotors either, its not that.