Revision question · Braking systems

You use a manually selected axle differential lock to escape a slippery patch. Which instruction should you follow when returning to normal grip?

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

Only after selecting top gear

Once the engine has warmed up

Disengage it promptly when normal grip is restored, following the vehicle handbook

As soon as the snow has cleared

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Disengage it promptly when normal grip is restored, following the vehicle handbookThis was the right answer

A selected differential lock helps traction on poor surfaces but can increase understeer. Disengage it when the poor conditions end, following the vehicle-specific procedure. Movement alone is not a universal instruction to switch it off; never assume all locking systems operate identically.

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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