What will happen if the brake drum is out of circle?

Brake drum is the basis of the vehicle wheel brake parts, generally used 14 or 18 gray iron, or malleable cast iron manufacturing. The damage of brake drum is mainly caused by the friction between brake disc and brake drum. Especially when the rivet head of brake friction piece is exposed, or the hard material such as sand is entered into the brake, the wear of brake drum is more serious. Will wear and tear caused by such hard material around the brake drum groove and strain, brake drum for inner wear more than 424 mm size limit Φ scrap accounts for roughly 30% of the overhaul period, or more. If the vehicle is overloaded and driving on the mountain road, the wear of the brake drum will be accelerated due to frequent use of the brake, and there will be a loss of circle and taper, resulting in early scrapping. The reason for the brake drum to crack is that the brake drum exceeds the limit size due to wear, and after boring for many times, the drum wall becomes thinner and cracks are generated under the action of load stress. When the inner diameter of the brake drum exceeds the limit of use, the vehicle will wade into the water immediately after the heavy load driving downhill or downhill, which will cause the sharp contraction of the brake drum after high temperature and make the friction surface of the brake drum crack along the axis direction.