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

Possible Answers:

a. Because the vehicle will suddenly roll backwards

b. Because it will cause the air pressure to rise

c. Because the service brake may not stop you

d. Because it will make the warning light go out

Think you know the answer to this theory test question?

Crown copyright material is reproduced under licence from the Driver and Vehicle Standards Agency, which does not accept any responsibility for the accuracy of the reproduction. The Driver and Vehicle Standards Agency does not endorse in any way any advertisement displayed on this website.