In the event of hydraulic brake failure, what should you NOT do?

Answer: C — Shift up

In the event of hydraulic brake failure, shifting up is not advisable because it can limit your control over the vehicle. When brakes fail, managing speed is crucial for safety, and shifting up could increase your speed, thus making it harder to maintain control. Instead, the correct approach involves actions that help reduce speed and stabilize the vehicle, such as downshifting to use engine braking. Utilizing the emergency brake is a necessary option to slow down, while looking for a clear area to coast allows you to steer the vehicle away from hazards. Each of these actions focuses on gaining control and ensuring a safe outcome in a potentially dangerous situation.