I had the same problem with my Andersen. Very loud and embarrassing when towing a new trailer - mine is 3 months old. Called Andersen and they told me the problem is water getting into the brake lining between the ball and hitch. They have a new replacement with an updated construction. The replacement is now, according to them, a "graphite impregnated, high-density poly-ethylene (HDPE)" compound. I recently installed this replacement and am once again proud to be towing an ollie.