Louisiana Class D Chauffeur's License Practice Test

The low air pressure warning activates when the pressure in the tanks falls below 60 psi. This is an important safety feature to ensure that the driver is alerted to decreasing air pressure levels, which can lead to brake system failure or reduced braking efficiency. Maintaining adequate air pressure is essential for the proper functioning of air brakes in commercial vehicles. If the pressure drops below this threshold, it indicates that the air supply for the brake system may be inadequate, prompting the driver to take necessary actions, such as safely stopping the vehicle and checking the system. Understanding the importance of this pressure level and the warning system helps drivers maintain safety on the road.