3. Brake disc deformation: If the brake disc is deformed or damaged, it will also cause the brake pad to make a crunching sound when it frictions. In hierdie geval is dit nodig om die remskyf betyds na te gaan en te vervang om die normale gebruik van die remstelsel te beïnvloed.

4. Brake system failure: If the brake system has oil leakage, bubbles or other faults, it may also cause the brake pads to emit abnormal boom sound. In hierdie geval is dit nodig om die remstelsel by die motorherstelwinkel betyds na te gaan en te herstel om bestuursveiligheid te verseker.