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Correct!

When can an endurance brake (retarder) be especially useful?

While driving down long hills
Correct answer
When driving on steep cambers
As a way to reduce gear changes
To improve fuel consumption

DVSA theory test explanation

Plan ahead and use your endurance brake (retarder) to help keep your speed in check on long downhill gradients. This can help to prevent your brakes from overheating and fading.

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