Rocks or debris in wheels or brakes

During normal driving, dirt, stones, or rocks can become lodged in the brakes or wheels. This can cause noise during braking, driving, or turning. For example, pieces of dust or dirt may get onto the brake linings. As the brakes are applied, the caliper or shoe presses the lining against disc or drum. The alteration in the stopping surface can produce a noise, much like worn linings.