When is it necessary to build the air pressure to proper levels?

Building the air pressure to proper levels before the vehicle is driven is essential for the safe operation of vehicles equipped with air brakes. Proper air pressure ensures that the brakes function effectively and can engage and release as needed. If the air pressure is not sufficient, the braking system may not operate correctly, risking the safety of the driver and others on the road.

This action is part of the pre-trip safety protocols that drivers must follow to confirm that the vehicle's braking system is ready for operation. Conducting a thorough checks of the air pressure establishes that the system will respond accurately during driving as expected.