What action should you take if your brakes fail while driving?

When faced with brake failure while driving, shifting to a lower gear and pumping the brakes is a crucial action to take. This approach helps to slow down the vehicle by utilizing engine braking, which can help reduce speed even when the brakes are not functioning effectively. Pumping the brakes can sometimes restore pressure momentarily in the braking system, potentially allowing for some braking action. Additionally, by engaging a lower gear, you can harness the engine's power to decelerate the vehicle more safely.

The other options do not address the immediate need to slow down and regain control of the vehicle effectively. Steering towards a ditch may seem like a way to slow down but can lead to loss of control or an accident. Turning off the engine can create further hazards, such as losing power steering and wheel control. Continuing to drive until the vehicle stops poses significant danger not only to the driver but also to other road users by failing to take necessary measures to reduce speed.