Revision question · Braking systems

On a legacy three-line trailer air-brake system, what colour identifies the auxiliary line?

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

Red

Blue

Green

Yellow

Show the answer

BlueThis was the right answer

Blue identifies the auxiliary connection on this legacy arrangement. Follow the actual coupling instructions; do not apply the three-line diagram indiscriminately to a modern two-line system.

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.

Loading the questions