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Incorrect!

You're about to start a journey in very frosty weather. What's the likely cause of low air-brake pressure?

Engine temperature too low
Weak engine anti-freeze mixture
Brake pedal needs adjustment
Frozen moisture in the storage tanks
Correct answer

DVSA theory test explanation

Air-brake systems use air from the atmosphere, which contains moisture. The moisture condenses under pressure, resulting in water in the system. Make sure the air tanks are drained daily to remove any water and to help prevent the system from freezing in cold weather.

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