The damping castles have the function of minimizing the rose and focusing the shock absorber, apart from reducing the inpact to the movement that it has when passing through a high The blow is ocacaca the rubber in poor condition The noise can be from a lack of squeeze from the nut to a game in the center of the casolet where it is unbeliented. A visual inspection is enough, since you will notice immediately if there is something in poor condition, you do not have to compare with anything you will notice immediately.