Revision question · Braking systems

The emergency line is common to both two-line and three-line brake systems. What colour is it?

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

Black

Yellow

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RedThis was the right answer

The red emergency line is common to both two-line and three-line braking systems. Always set the parking brake before disconnecting any brake line.

Reviewed reading for this question

Keep trailer connections and parking brakes distinctReviewed guidance summary · Both questions specifically identify the red emergency line; the guide does not invent the obsolete third-line procedure.

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