The sway bar link connects the sway bar to the suspension, an often overlooked replacement item on higher mileage BMW's, fits front left and front right applications If you are going over bumps or dips in the road and you can hear an audible clicking sound, chances are your sway bar links need to be replaced. The sway bar link on your BMW attaches the sway bar to the suspension and it "loads" the sway bar in order to reduce body roll. The ball joints are a common failure point on this sway bar link and when they are worn out you will hear noise in your front suspension at low speeds.