rear wheel rattled - Toyota Cresta, 2.0 L, 1997

I traveled at -40 for almost a month, every day, and then suddenly there was a thud in the rear wheel. At first I thought that the jack was unscrewed, which is attached to the niche near this wheel. checked everything is fine, looked into the arch - the rack is dry, all the more less a year has passed since I changed them! I called the suspension specialists and they say that a hundred pounds of the rack is numb. I tell them how the others work, I have not heard an intelligible answer to this. Having traveled for another week, I looked to one iconic cheburek who has been engaged in suspensions on the Japanese all his life. As a result, replacing the rear ball joint 500r. and the support itself 920r. half an hour business and the knock was gone!