What is the correct way to check the brakes?

Answer: B — Test the brakes for proper function, both service and emergency brakes

The correct way to check the brakes involves testing both the service brakes and the emergency brakes to ensure that they are functioning properly. This comprehensive approach is vital for safety because the service brakes are the primary braking system used during typical driving, while the emergency brakes are critical in situations where the service brakes fail. By checking both systems, a driver can confirm that all components are working correctly, which is essential for the safe operation of a commercial vehicle. Proper brake function is not only a matter of performance but also of compliance with safety regulations. Regular inspections help prevent accidents caused by brake failure and help ensure the vehicle operates reliably. The other options focus on a limited aspect of brake checks, such as only assessing the emergency brake, checking brake fluid levels, or inspecting brake pads, which do not provide a complete overview of the braking system's condition. Each of these oversights could lead to hazardous situations on the road if other parts of the system are neglected during inspection. Regular comprehensive checks are necessary to maintain the overall safety and reliability of the braking system.