Which component do air brakes utilize to function?

Air brakes operate using compressed air as their primary functional component. When the driver engages the brakes, air is released from the storage tanks through control valves, which causes the brake pads to press against the brake drum or disc. This action generates friction, slowing down or stopping the vehicle. The use of compressed air allows for quick and effective braking, which is particularly important for large vehicles like trucks and buses that require significant stopping power.

Hydraulic fluid is not used in air brake systems. Instead, hydraulic brakes rely on fluid pressure generated by a master cylinder to activate the brake components. A manual lever alone does not enable the complex operation of air brakes since it primarily helps in controlling the direction or application of braking force rather than generating it. Electric motors are also not part of the air brake system; while they might assist in certain braking functions in other systems, air brakes specifically depend on air pressure for their operation.