Your vehicle is fitted with a ‘diff-lock’. When would you normally use it?

Explanation: The differential allows the drive wheels to rotate at different speeds; this is necessary for the vehicle to negotiate corners and bends. On a slippery surface, however, it can cause problems: if one wheel has less traction, it can spin, resulting in a complete loss of drive. The 'diff-lock' prevents the wheels from turning independently and so helps to stop this happening.

Category: Braking Systems

References: The Official DVSA Guide to Driving Goods Vehicles: Section 2