The steering knuckle itself does not often fail. It is possible for the knuckle to become damaged if the vehicle is in a crash, or if it encounters a large pothole. It is more likely that the components in and around the steering knuckle - ball joints, bearings, control arm bushings, tie rod ends - are worn. If indeed the steering knuckle is damaged,
symptoms might include tires that are excessively worn on the inside and outside edges or the vehicle
pulls to one side when driving. A damaged steering knuckle might present during a suspension alignment. The threads with which the brake caliper is connected to the steering knuckle may become damaged at some point during brake system service. If the threads are damaged, the knuckle should be replaced.