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Free Colorado DMV Double Endorsement Test 1
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Question Number 18
18. A one-way check valve:
Drains the water and compressor oil from the air tanks.
Prevents air from escaping if the air compressor has a leak.
Activates the emergency brakes when there is a leak.
Holds the spring brakes in position until they are used.
✔ Correct Answer:
Prevents air from escaping if the air compressor has a leak.
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