During the brake check, what is indicated by a sudden loss of air pressure?

A sudden loss of air pressure during a brake check is a critical indicator of potential system failure. In vehicles equipped with air brakes, maintaining the appropriate air pressure is essential for the brakes to function correctly. A significant drop in air pressure could suggest a leak or failure within the braking system, which may lead to a loss of braking power. It's vital for drivers, especially those operating school buses, to recognize this alarm signal and take immediate action to ensure the safety of the vehicle and its passengers. Regular brake checks and prompt attention to any warning signs are essential practices that contribute to maintaining vehicle safety and integrity.