What components should be inspected during the brake test?

The correct answer emphasizes the importance of inspecting both the service brake and the parking brake during a brake test. The service brake is critical as it is the primary braking system that allows a vehicle to stop when needed. This system typically includes components such as brake pads, rotors, and hydraulic parts. Ensuring that the service brake is functioning properly is vital for the safety of the vehicle and its occupants.

The parking brake, also known as the handbrake or emergency brake, serves a different purpose but is equally important. It is used to keep the vehicle stationary when parked and is especially crucial on inclines. Inspecting the parking brake ensures that it can hold the vehicle in place securely and can also be relied upon in emergency situations.

While other options may include relevant components, they do not specifically address both critical braking systems necessary for a comprehensive brake test. For example, the inclusion of the cooling system in one option is not directly related to brake performance, and while tires are essential for vehicle safety, they do not pertain to the brake function itself. Thus, focusing on both the service and parking brakes allows for a thorough evaluation of the vehicle's braking capabilities.