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Correct!

You've just started the engine. What must you do if the brake air-pressure warning light is showing?

Report it as a fault
Keep the parking brake on
Correct answer
Switch your engine off
Engage the clutch

DVSA theory test explanation

Even though the warning light is showing, there may be sufficient pressure to release the parking brake. However, you mustn't do this, because there may not be enough air pressure to operate the service brake.

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