What is the purpose of a one-way check valve in an air brake system?

Question: What is the purpose of a one-way check valve in an air brake system?

Answer options:

• To prevent air from flowing back from the service reservoirs to the supply reservoir. ✅ To allow air to flow in only one direction, preventing pressure loss in specific lines or tanks.
• To bypass the air dryer if it becomes clogged, ensuring air supply.
• To regulate the pressure delivered to the brake chambers during an emergency stop.

Correct answer: To allow air to flow in only one direction, preventing pressure loss in specific lines or tanks.

Explanation: One-way check valves (or simply check valves) are crucial for maintaining pressure integrity within the system, ensuring that air flows only in the intended direction and preventing pressure loss in specific parts, such as auxiliary reservoirs or split service systems.