Revision question · Braking systems

What should you avoid when using an independent endurance brake (retarder) on slippery roads?

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

The front wheels spinning

The drive wheels locking

Brake-pad wear

Anti-skid road surfaces

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The drive wheels lockingThis was the right answer

The endurance brake (retarder) usually operates by applying resistance, via the transmission, to the vehicle's driven wheels. If the road is slippery, the tyres may lose grip and the wheels will lock.

Reviewed reading for this question

Respect the retarder’s low-grip restrictionReviewed guidance summary · An independent retarder can lock or slide the driven wheels on snow or other low-grip surfaces; the lesson retains vehicle-specific prohibitions rather than merely saying to pull the lever gently.

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