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

The primary function of the air brake system in a commercial vehicle is to provide stopping power for the vehicle. Air brakes are vital for safely slowing down and stopping heavy vehicles, which require significantly more force to halt than lighter vehicles due to their mass. The air brake system uses compressed air to activate brake chambers that push the brake pads against the brake drums or discs, thereby generating the friction needed to stop the wheels from turning.

While enhancing fuel efficiency is important in vehicle operation, this is not the role of the air brake system. Controlling the vehicle's speed is more about managing acceleration and deceleration through various methods, including throttle control, rather than solely depending on the braking system. Adjusting suspension height is a separate function pertaining to ride quality and handling, and again, is unrelated to the primary role of the brake system. Thus, the focus of the air brake system is firmly on providing reliable and effective stopping power, making it essential for safety and compliance in commercial vehicle operation.