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Correct!

What can coasting downhill seriously affect?

The air brakes
Correct answer
The cooling system
The tachograph
The electrical systems

DVSA theory test explanation

Air-brake systems rely on an engine-driven compressor to keep the reservoir tanks at their operating pressure. Coasting downhill and relying on the brakes to control your speed could result in the loss of sufficient air pressure to operate the brakes effectively.

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