What is the risk of using the parking brake when the brakes are hot?

Using the parking brake when the brakes are hot can indeed lead to the brakes binding, which is the correct choice in this scenario. When brakes heat up during operation, the brake components expand due to the heat. If the parking brake is engaged in this condition, it can create excessive pressure on the brake components. This can lead to the brake shoes or pads becoming stuck to the drum or rotor, preventing them from disengaging properly when you attempt to drive the vehicle again.

This situation can be particularly problematic because it can result in diminished braking performance and may cause the vehicle to become difficult to control. Additionally, binding brakes can lead to uneven tire wear and additional strain on the braking system, possibly necessitating costly repairs.

The other potential risks listed in the other options are not directly associated with using the parking brake when the brakes are hot. For instance, brake leaks and damage to brake lines are typically related to mechanical failures or improper maintenance rather than the use of the parking brake when the brakes are hot. Brake fade usually occurs due to continued overheating of brake components from excessive use or inadequate cooling, rather than the actions of applying the parking brake. Thus, the likelihood of binding is the major concern when hot brakes are engaged with the parking mechanism.