How is air pressure maintained in an air brake system?

Air pressure in an air brake system is maintained by using a compressor that draws in air and maintains pressure within the system. The compressor is driven by the vehicle's engine and plays a crucial role in ensuring that the air brakes function properly. When the engine runs, the compressor sucks in atmospheric air and compresses it, transferring it into the air tanks. This pressurized air is essential for activating the brakes when needed.

The pressure must be maintained consistently within specified limits to ensure effective braking performance. Should any component within the system fail or develop a leak, it can lead to a drop in air pressure, potentially compromising the vehicle's braking capability. Therefore, a reliable compressor is vital, as it continually replenishes and maintains adequate air pressure as the system operates.

Other methods, such as manually pumping air or utilizing a vacuum system, are not standard practices for maintaining air pressure in modern air brake systems. Additionally, a pressurized gas tank is not suitable for this purpose, as the air brake system specifically relies on compressed atmospheric air, rather than gas from a tank.