When the bushings become torn, worn out or completely break, the stabilizer bar itself will become unstable and cause a rattling or clunking sound while you are driving. The noise will get progressively louder when you steer the car in either direction or when you are driving on a rough road
Some of the most common symptoms of a bad sway bar bushing or sway bar links going bad are:
Clunking noise.
Rattling noise.
Knocking uneven noise road.
Lack of stability when driving.
Noise going over speed bumps.
Poor handling when turning.