What could happen if brakes are used excessively on a downhill?

Using brakes excessively while driving downhill can lead to overheating and subsequent fading of the brakes. When a driver continually applies the brakes, especially on steep inclines, the friction generated between the brake components generates a significant amount of heat. As this heat builds up, the effectiveness of the brakes can diminish—a phenomenon known as brake fade. This decrease in braking effectiveness can create a dangerous situation because the driver may find it more challenging to slow down or stop when needed, significantly increasing the risk of losing control of the vehicle.

While one might think that applying brakes frequently would help maintain control and slow the vehicle, the reality is that managing speed effectively on a downhill gradient often requires a combination of engine braking (using the vehicle's transmission to assist with slowing down) and careful speed management. Excessive reliance on the brakes alone can lead to failure in critical situations, thereby compromising safety on the road.

In contrast, issues such as improving fuel efficiency, increasing speed significantly, or doubling braking power do not accurately reflect the consequences of improper brake usage on downhill sections. The focus should instead be on maintaining control of the vehicle while avoiding potential brake failure through overuse.