True or False: Using the hand lever only to apply trailer brakes can overheat the brakes, causing a fire and/or brake failure.

Answer: A — True

Using the hand lever only to apply trailer brakes can indeed overheat the brakes, leading to potential fire hazards and brake failure. When the hand lever is used to engage the trailer brakes, it is often applied more forcefully or for longer periods than necessary. This can create excessive friction within the brake system, causing the components to heat up significantly. If the brakes overheat, it can lead to a condition known as brake fade, where the efficiency of the brakes decreases, making it difficult to stop the vehicle properly. Beyond brake fade, excessive heat can damage brake components and, in severe cases, lead to a fire as the materials begin to break down or ignite due to high temperatures. Therefore, it is crucial to use trailer brakes judiciously and in conjunction with other braking systems to maintain optimal performance and safety while driving.