What does the air brake system in a commercial vehicle use to operate?

The air brake system in a commercial vehicle operates using compressed air. This system is specifically designed to utilize air pressure to create the force needed to engage the brakes. The mechanism involves storing compressed air in tanks, which is then released to activate the braking system when the driver presses the brake pedal. This method is essential for large vehicles, as it provides reliable and powerful braking capabilities suitable for their weight and size.

In contrast, other systems like hydraulic brakes, which use hydraulic fluid, are not utilized in air brake systems. Electricity and oil pressure also do not play a role in the operation of air brakes; thus, they are not applicable to this type of braking system. This design makes air brakes particularly effective for commercial vehicles, ensuring they can stop safely and efficiently under various driving conditions.