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Correct!

What should you do after driving through a flood?

Carry out an emergency stop
Drive in a low gear with the footbrake lightly applied
Correct answer
Avoid braking until the brakes have dried out
Pump the footbrake when approaching hazards

DVSA theory test explanation

If you have to drive through a flood, do so with caution. Once out of the flood, you need to test your brakes to make sure they're working properly. To do this, check what's behind you, then drive in a low gear with the brakes gently applied.

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