Which of the following is a common safety feature in air brake systems?

The anti-lock braking system (ABS) is a common safety feature in air brake systems because it enhances vehicle control and stability during braking circumstances. ABS helps to prevent wheel lock-up during hard braking, which can lead to skidding. This system uses sensors to monitor wheel speed and, when it detects that a wheel is about to lock up, it momentarily releases brake pressure on that wheel to allow it to continue turning, thus maintaining traction and steering control. This feature is especially important in adverse weather conditions, such as rain or snow, where maintaining grip on the road is critical for safe stopping.

In the context of air brake systems, ABS plays a crucial role in improving overall safety by reducing stopping distances and allowing the driver to maintain steering control during emergency braking situations, making it a vital addition to trucks and larger vehicles that utilize air brakes.