What should a driver do if their brakes fail while driving?

When brakes fail while driving, the best response is to try to downshift and slow down, using the emergency brake as needed. This approach allows the driver to regain some control over the vehicle's speed. Downshifting can help reduce speed by utilizing engine braking, which can be particularly effective in managing a vehicle that is losing braking power.

Additionally, the emergency brake, also known as the parking brake, can be engaged to slow down the vehicle further. It is essential to apply the emergency brake gradually to prevent skidding or losing control. This method increases the chances of safely bringing the vehicle to a stop without causing an accident.

While sounding the horn could alert other drivers, it does not directly address the critical issue of stopping the vehicle. Accelerating would only exacerbate the situation and increase the risk of an accident. Stepping off the road could also lead to a dangerous scenario, especially if done without control over the vehicle's speed. The strategy of downshifting and using the emergency brake represents a more effective and safer method for handling this dangerous situation.