Might be something loose in the suspension, or worn struts, or brake issues. Warped rotors and caliper/brake hose issues could cause that easily. After finding that to be a common problem with Accords, I put the wagon front brakes on, as they are bigger and can take a lot more heat than the sedan brakes. An open design of aluminum wheel would reduce the tendency to warp as well, by aiding cooling of the brake rotors.