New Jersey Air Brakes Practice Test

If one of the systems in a dual air system is low on pressure, what is likely to happen?

1. Brakes will overheat

2. All brakes will be fully functional

3. Only one set of brakes will be fully functional

4. Brakes will become more responsive

The correct answer is: Only one set of brakes will be fully functional

In a dual air system, two separate air brake systems are designed to enhance safety. Each system operates independently, allowing at least one to function effectively even if the other experiences a failure or pressure drop. If one system is low on pressure, it is likely that only the brakes connected to the functioning system will operate properly, while the brakes linked to the compromised system will be less effective or inoperative. This means that only one set of brakes will be fully functional, maintaining some level of braking ability while still posing a risk if the remaining brakes are insufficient. The other scenarios do not accurately reflect the mechanics of a dual air brake system under low pressure conditions. When one system fails to maintain pressure, it does not typically lead to overheating brakes, fully functional brakes for both systems, or increased responsiveness. Rather, it highlights the importance of monitoring both air systems for adequate pressure to ensure safe operation of the vehicle.