Air Brake (Q Endorsement) Practice · Question
What does a green light on a 'trailer service brake' (yellow diamond-shaped) valve typically indicate?
A green light on the 'trailer service brake' valve typically indicates that the trailer's service brakes are released, allowing compressed air to flow through a
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Question: What does a green light on a 'trailer service brake' (yellow diamond-shaped) valve typically indicate?
Answer options: ✅ The trailer's service brakes are released.
- The trailer's service brakes are applied.
- The trailer's air tanks are full.
- There is a problem with the trailer's air lines.
Correct answer: The trailer's service brakes are released.
Explanation: A green light on the 'trailer service brake' valve typically indicates that the trailer's service brakes are released, allowing compressed air to flow through and keep the spring parking brakes from engaging.
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