What is the purpose of the brake lining in air brakes?

Answer: B — To create friction against the brake drum for stopping power

The purpose of the brake lining in air brakes is primarily to create friction against the brake drum, which is essential for generating the stopping power required to halt the vehicle. When the brake is applied, the brake lining presses against the inner surface of the brake drum. This frictional force is what slows down or stops the rotation of the wheels. The effectiveness of the brake system is heavily dependent on the quality and condition of the brake lining, as it directly influences the vehicle's braking performance. Proper maintenance of the brake lining is crucial to ensure the safety and reliability of air brake systems.