What is the primary purpose of the air brake system in a commercial vehicle?

The primary purpose of the air brake system in a commercial vehicle is to safely stop the vehicle using compressed air. This system is specifically designed to provide reliable and effective braking power for heavy vehicles, which often require greater stopping force due to their size and weight. Air brakes are capable of delivering strong and consistent braking performance, especially under the demanding conditions typically faced by commercial trucks.

When the driver applies the brake pedal, the air brake system uses compressed air to activate brake chambers that push against brake shoes, which in turn press against the brake drums. This mechanism allows for a controlled and safe stop, essential for preventing accidents and ensuring the safety of both the driver and other road users.

Other functions like increasing acceleration or enhancing fuel efficiency are not related to the primary function of the air brake system. Rather, the air brake's main focus is on providing effective stopping power, which is critical in the operation of heavy-duty vehicles.