Which of the following must be inspected for leaks during pre-trip inspections?

During a pre-trip inspection for a commercial vehicle, it is vital to check various systems to ensure safety and reliability on the road. Inspecting for leaks in transmission lines, fuel lines, and coolant lines is crucial because leaks can lead to significant mechanical failures and safety hazards.

By assessing transmission lines, you verify that there are no leaks that could impair driving performance or lead to transmission failure. Fuel leaks pose a severe fire hazard, so ensuring fuel lines are intact is essential for safety and compliance with regulations. Coolant leaks can result in overheating engines, which can cause severe engine damage and lead to breakdowns.

Inspecting all these lines helps ensure that the vehicle operates efficiently and safely, reducing the likelihood of accidents or vehicle malfunctions during transit. Therefore, a comprehensive inspection covering all these areas is necessary to maintain a safe and reliable vehicle for commercial driving.