What action should be taken in the event of brake failure while driving?

In the event of brake failure while driving, shifting to a lower gear and using the emergency brake is the most effective response. When you shift to a lower gear, it helps to reduce the vehicle's speed due to engine braking, which is a natural deceleration that occurs when the engine is forced to work harder. This action can slow down the vehicle and provide more control as you reduce speed.

Using the emergency brake, also known as the parking brake, is crucial during this situation because it can help bring the vehicle to a stop when the regular brakes are not functioning. The emergency brake typically operates mechanically and can still engage even if the hydraulic brake system has failed.

This combination of actions allows the driver to manage the situation more effectively and safely, reducing the risk of an accident when faced with the loss of brake function.