Revision question · Braking systems

You're stationary. The brake air-pressure warning light comes on. Why should you keep the parking brake on?

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

Because the vehicle will suddenly roll backwards

Because it will cause the air pressure to rise

Because the service brake may not stop you

Because it will make the warning light go out

Show the answer

Because the service brake may not stop youThis was the right answer

Even though a warning device indicates low air-brake pressure, you may still be able to release the parking brake. If you do this and start moving, the service brake may be ineffective and you may not be able to stop.

Reviewed reading for this question

Do not move with unsafe brake-air pressureReviewed guidance summary · A warning while stationary means keep the parking brake applied; one during travel requires a safe stop and fault repair. The ability to release the park brake does not prove sufficient service-brake pressure.

Loading the questions