Air Brake (Q Endorsement) Practice · Question
What is the purpose of a relay valve in an air brake system, particularly in long combination vehicles or trailers?
Relay valves are positioned closer to the brake chambers on longer vehicles or trailers. They receive a small pilot air signal from the foot valve, then use mai
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Question: What is the purpose of a relay valve in an air brake system, particularly in long combination vehicles or trailers?
Answer options:
- To allow the driver to manually release the parking brakes. ✅ To speed up the application and release of air to distant brake chambers.
- To regulate the overall maximum air pressure in the system.
- To combine air from multiple reservoirs into a single line.
Correct answer: To speed up the application and release of air to distant brake chambers.
Explanation: Relay valves are positioned closer to the brake chambers on longer vehicles or trailers. They receive a small pilot air signal from the foot valve, then use main reservoir air to quickly apply or release the brakes, reducing response time for distant brakes.
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