It does it at some speeds, and at other speeds it doesn't happen. I recently had the front rotors replaced because it was rattling a lot when hitting the brakes. It doesn't rattle when hitting the brakes anymore. It would be nice if it stops ratting altogether.

 

Road Force wheel balancing at a reputable shop is in order.

Then, if it is still there, have the front suspension bushings and shocks checked out, and an alignment check.