Which of the following can contribute to brake failure?

The option that identifies overheating of brakes as a contributor to brake failure is correct. Brakes function by converting kinetic energy into heat through friction, which is a fundamental part of their operation. However, excessive heat can cause the brake components to malfunction. When the brakes overheat, they can lose their effectiveness, leading to a condition known as "brake fade," where the brake pads become less effective at creating friction with the rotors. This can significantly impede a driver's ability to slow down or stop, potentially leading to dangerous situations.

In contrast, the other choices do not inherently contribute to brake failure. Driving on flat roads and at low speeds generally allows for better control and less strain on the braking system. In fact, low-speed driving typically results in less heat generation compared to high-speed driving. Using engine braking effectively can help reduce the reliance on the brakes themselves, thereby helping to maintain their temperature and performance. Therefore, managing heat and understanding brake operation are crucial to ensuring safe driving and preventing brake failure.