What essential feature is found in air-brake equipped vehicles?

In air-brake equipped vehicles, an air supply pressure gauge is a vital component that provides real-time information about the pressure of the air in the braking system. This gauge helps the driver monitor whether the air pressure is at a sufficient level to operate the brakes effectively. Maintaining adequate air pressure is crucial for the safe functioning of air brakes, as they rely on compressed air to operate. If the pressure drops below a certain threshold, the brakes may not function properly, which could lead to dangerous situations while driving.

The presence of an air supply pressure gauge allows the driver to perform necessary checks and ensure the brake system is working correctly before and during operation, promoting safety on the road. Proper air pressure is essential not only for effective braking but also for the activation of various safety features tied to the brake system, such as warning signals if air pressure falls to unsatisfactory levels.