Revision question · Braking systems

You have to drive onto a muddy building site. Why should you switch on your diff-lock?

Revision material from the imported DVSA bank includes source-checked Lanekind learning corrections. These corrections are not newly issued official examination questions, and practice does not reproduce a live test paper.

Answer options

To make your steering lighter

To improve your fuel consumption

To increase your engine power

To make the wheels less likely to spin

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To make the wheels less likely to spinThis was the right answer

Engaging the diff-lock means that the driven wheels are locked together. This reduces the likelihood of wheel spin. Remember to switch off the diff-lock as soon as you're on firm ground again, otherwise you could damage the transmission.

Reviewed reading for this question

Use a differential lock only for suitable low-grip conditionsReviewed guidance summary · Mud and snow can leave a drive wheel without traction; the selected lock helps forward drive but changes steering. The corrected escape question no longer says any movement always requires immediate disengagement.

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