BC Air Brake Practice · Question
What is the primary advantage of a relay valve in a long air brake system, such as on a combination vehicle?
Relay valves are used to shorten the time lag in applying and releasing brakes on long vehicles (like trailers), by supplying air directly from a local reservoi
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Question: What is the primary advantage of a relay valve in a long air brake system, such as on a combination vehicle?
Answer options: ✅ It speeds up the application and release of the service brakes.
- It stores additional air pressure for emergencies.
- It filters impurities from the air supply.
- It prevents air from freezing in cold weather.
Correct answer: It speeds up the application and release of the service brakes.
Explanation: Relay valves are used to shorten the time lag in applying and releasing brakes on long vehicles (like trailers), by supplying air directly from a local reservoir near the brake chambers, rather than from a distant control valve.
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