What device helps ensure safety by warning of low air pressure in the braking system?

The device that plays a crucial role in ensuring safety by warning of low air pressure in the braking system is a pressure sensor. This component continuously monitors the air pressure within the braking system, and when it detects a drop below a certain threshold, it activates a warning signal. This alert enables the driver to take immediate action to address the issue, ensuring the braking system remains functional and safe.

A warning light can indicate issues, but it relies on input from the pressure sensor to activate. An alarm system may provide an audible alert but is typically tied to the warning light mechanism and does not measure air pressure directly. A relief valve serves a different purpose by allowing excess pressure to escape but does not signal low pressure conditions. Hence, the integral role of a pressure sensor in monitoring and alerting for low air pressure directly contributes to the safe operation of the vehicle’s braking system.