What is the first thing you should do if your brakes fail while driving downhill?

Answer: B — Get off the road as soon as possible.

When faced with brake failure while descending a hill, the most crucial action is to get off the road as soon as possible. This option is the correct response because continuing to drive without effective brakes poses an immediate danger to both the driver and other road users. By steering off the road, you can find a safe area to bring the vehicle to a stop, ideally on a shoulder or another flat surface. Using the emergency brake might seem like an option, but it can lead to the wheels locking up and the vehicle skidding, which may result in loss of control. Slowing down gradually can help, but if the brakes are entirely non-functional, this may not be sufficient to stop the vehicle on a downhill slope. Notifying nearby drivers is important, but it does not address the immediate need to prevent a collision or accident. Prioritizing getting off the road swiftly enhances safety and allows for a controlled stop.