Final answer:
If your brakes fail, you should shift into a lower gear and use the emergency brake as a backup measure.
Step-by-step explanation:
When your brakes fail, it is important to know the correct steps to take to ensure your safety. In this situation, you should shift into a lower gear to help slow down the vehicle. This technique is known as engine braking and can help to reduce your speed when your brakes are not working properly. Additionally, you should also use the emergency brake as a backup measure. The emergency brake operates independently of the main braking system and can be used to bring the vehicle to a stop safely.