**Sway bar links, also called stabilizer bar links, are an often overlooked** Replacement item on most cars. Their main purpose is to attach the sway bar to the suspension as well as to "load" the sway bar when your BMW is in a corner. With age and high mileage the sway bar link ball joints can wear out which results in front end play which can usually be heard when you travel over bumps at slow speed. We always recommend replacing sway bar links in pairs for the best service life and performance.