What pressure indicates that something may be wrong in an air brake system?

Study for the North Carolina School Bus Driver Test. Review flashcards and multiple choice questions, each question includes hints and explanations to help you prepare. Get ready for your exam!

In an air brake system, a pressure reading of 150 psi is significant because it indicates that the system is functioning at or near its maximum capacity. If the pressure were to exceed this level, it could signal a malfunction or that the system is overloaded, which can lead to brake failure or other safety hazards. Proper maintenance and monitoring of air pressure are critical to ensure that the brakes operate effectively and safely.

Meanwhile, pressure readings below this threshold, like 60 psi, 90 psi, or 120 psi, may indicate normal operating conditions or less critical issues, but they do not communicate an imminent risk as strongly as a reading of 150 psi would. Understanding the threshold pressure levels is essential for any school bus driver, as it directly impacts the safety of the vehicle and its passengers.

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