Revision question · Braking systems

On a manufacturer-approved combination of a red-and-yellow two-line tractor and a legacy three-line trailer, which trailer connection is not used?

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 trailer auxiliary line should be left unconnected

The trailer service line should be left unconnected

Only the service line should be connected

Only the auxiliary line should be connected

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The trailer auxiliary line should be left unconnectedThis was the right answer

The trailer’s auxiliary connection is unused in this approved arrangement. Secure the vehicle and follow the actual coupling and brake-test procedure.

Reviewed reading for this question

Check the approved legacy coupling arrangementReviewed guidance summary · These explicitly legacy questions identify the auxiliary connection without making old diagrams universal coupling instructions.Inspect the fifth wheel before the controlled tug testReviewed guidance summary · These explicitly legacy questions identify the auxiliary connection without making old diagrams universal coupling instructions.

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