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2026 District Of Columbia DMV Knowledge Test Class B Test 2
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Question Number 3
3. In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.
✔ Correct Answer:
A separate air tank can be used to release the spring brakes for a short period of time.
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