What should a driver do if their brakes fail?

Answer: A — Shift to a lower gear, pump the brakes, and use the emergency brake if needed

In the event that a driver's brakes fail, shifting to a lower gear, pumping the brakes, and using the emergency brake if necessary is a crucial and effective response. Shifting to a lower gear helps to slow down the vehicle through engine braking, which reduces speed without relying on the brakes. Pumping the brakes may restore some pressure in the brake system, potentially helping them to engage temporarily. The emergency brake, also known as the handbrake, is a backup system designed to bring the vehicle to a stop safely. Utilizing these methods in combination allows the driver to regain control and reduce speed, increasing their chances of stopping the vehicle without unnecessary danger to themselves and others on the road. The other options do not provide practical or safe solutions to the immediate problem of brake failure. Stepping off the road immediately without proper control may lead to collisions or accidents. Calling for roadside assistance while stationary does not address the immediate risk of losing control. Driving through stop signs is dangerous as it disregards traffic rules and the safety of other road users, further increasing the risk of accidents.