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Correct!

You're stationary. The brake air-pressure warning light comes on. Why should you keep the parking brake on?

Because the vehicle will suddenly roll backwards
Because it will cause the air pressure to rise
Because the service brake may not stop you
Correct answer
Because it will make the warning light go out

DVSA theory test explanation

Even though a warning device indicates low air-brake pressure, you may still be able to release the parking brake. If you do this and start moving, the service brake may be ineffective and you may not be able to stop.

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