Revision question · Braking systems

Compared with a red-and-yellow two-line trailer air-brake system, which extra connection is present on the legacy three-line arrangement?

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

Emergency

Service

Electrical

Auxiliary

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AuxiliaryThis was the right answer

The additional connection is the auxiliary line. Before coupling, establish that the combination is compatible and follow its specified 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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