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Correct!

In frosty weather, what precaution could a lorry driver take to prevent moisture from freezing in the air-brake system?

Drain the air tanks daily
Correct answer
Cover the air tanks with a blanket
Keep the engine at high revs when starting
Pump the brakes

DVSA theory test explanation

You should make sure that you drain the air tanks daily to avoid moisture in the system. Most modern vehicles have an automatic draining system, which should be checked regularly.

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