What should you do if your brakes fail while driving?

In the event of brake failure while driving, the most effective response is to pump the brakes, shift to a lower gear, and if necessary, use the emergency brake. Pumping the brakes can sometimes build up brake pressure if the failure is not complete, allowing for a brief moment of braking power. Shifting to a lower gear helps to slow the vehicle down as it engages engine braking, which can assist in control and deceleration. The emergency brake (also known as the parking brake) can be engaged carefully to bring the vehicle to a stop, but this should be done gradually to prevent skidding or loss of control.

On the other hand, attempting to accelerate to stop faster is counterintuitive and increases the risk of a collision. Steering off the road can potentially lead to hazards or unknown obstacles outside the roadway and should only be considered in certain situations where it is safe to do so. Turning on hazard lights and stopping can be useful once the vehicle has come to a controlled stop, but it does not address the immediate need to slow down if the brakes have failed. Thus, the combination of these actions in the correct option prepares a driver to manage a challenging and potentially dangerous situation effectively.