If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
A. Balance the service brake system when you are parked.
B. Stay parked twice as long without using up service air pressure.
C. Release the emergency/spring/parking brakes to move a short distance.
Answer: C. Release the emergency/spring/parking brakes to move a short distance.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.