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Correct!

Your vehicle is fitted with air brakes. What does it mean if a brake warning light shows when you've just started the engine?

Low air pressure
Correct answer
Increased air pressure
The parking brake's not working
The air reservoirs are fully charged

DVSA theory test explanation

It's dangerous to drive a vehicle with low air pressure. To alert you to this, all vehicles are fitted with a warning light and/or buzzer. Do not move your vehicle if this warning shows or sounds.

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