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Incorrect!

Where must extra care be taken when using an endurance brake (retarder)?

On uneven roads
On slippery roads
Correct answer
On downhill gradients
On uphill gradients

DVSA theory test explanation

The endurance brake (retarder) slows the vehicle without the use of the wheel-mounted brakes. However, care should be taken in slippery conditions, when the retarder's effect can be powerful enough to cause a skid.

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