A truck brake drum is a critical component in the drum braking system of heavy-duty trucks, typically crafted from high-grade cast iron or specialized alloys to withstand immense heat and friction generated during braking. It forms a cylindrical housing that encases brake shoes, which press outward against its inner surface to create the frictional force needed to slow or stop the vehicle. Engineered for durability and heat dissipation, truck brake drums are designed to endure repeated high-stress braking cycles while maintaining structural integrity, ensuring reliable stopping power and safety in demanding commercial transportation applications.