Try a DVSA LORRY Theory Test Revision Question (81 of 104)

Q: You're about to drive an unfamiliar vehicle. What should you do if you think there may be moisture in the air-brake reservoir?
A: Assume the system has automatic drain valves
A: Find out whether you need to drain the system manually
A: Nothing; it's the vehicle owner's responsibility
A: Leave the engine running for a while before driving
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