New Jersey Air Brakes Practice Test 2025 – The All-in-One Guide to Master Your Exam Success!

Question: 1 / 400

How are air brake systems powered in commercial vehicles?

By an electrical battery

By a vehicle's air compressor

Air brake systems in commercial vehicles are powered by a vehicle's air compressor. The air compressor is a vital component that takes atmospheric air and compresses it to be stored in air tanks. This compressed air is then used to operate the air brakes, which enables the vehicle to slow down or stop effectively. The system relies on the pressure of the compressed air to activate the brake mechanisms, ensuring reliable performance even under heavy loads.

While other power sources, such as electrical batteries and hydraulic fluid pressure, are used in various braking systems (like hydraulic brakes found in light vehicles), air brakes depend specifically on compressed air. The engine's fuel system also serves a different purpose and does not directly influence the braking mechanism in this context. Thus, understanding the role of the air compressor provides insight into how air brake systems function efficiently in commercial vehicles.

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By hydraulic fluid pressure

By the engine's fuel system

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