Revision question · Vehicle condition

You're uncoupling a trailer. What must you do before disconnecting any of the air lines?

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

Drain the air tanks

Apply the trailer parking brake

Lower the landing gear

Disconnect the electrical line

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Apply the trailer parking brakeThis was the right answer

Whenever you uncouple a trailer, you must work through the uncoupling process methodically. Start by making sure that the brakes are applied on both the vehicle and the trailer.

Reviewed reading for this question

Inspect the fifth wheel before the controlled tug testReviewed guidance summary · The fifth wheel connects tractor and trailer; the dog clip secures the release mechanism. The corrected final-stage wording retains the full walkaround after coupling.

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