What should you do if your brakes fail while driving?

When experiencing brake failure while driving, the most appropriate action is to shift into a lower gear, use the parking brake, and steer to a safe area. This approach leverages the engine's resistance to help slow down the vehicle effectively, as moving to a lower gear can increase engine braking. Engaging the parking brake gradually helps to stop the vehicle without causing a loss of control, as using it too abruptly could lead to skidding. Steering towards a safe area ensures you can avoid obstacles or hazards, allowing for a controlled and careful stop.

In contrast, accelerating to stop safely is not advisable; speeding up during a brake failure can greatly increase the risk of losing control. Using the horn to alert others may not adequately address the situation of failing brakes, as it does not contribute to safely stopping the vehicle. Switching off the engine immediately could lead to a loss of steering control as well as the potential for a dangerous situation if power steering or other vehicle systems become inoperative. Overall, the correct response emphasizes maintaining control of the vehicle and guiding it safely to a stop.