Illinois CDL Practice Exam 2025 – The All-in-One Guide to Master Your Commercial Driving Test!

Question: 1 / 400

During a pre-trip inspection, what should be checked regarding the engine?

Exhaust smoke characteristics

Fluid levels and leaks

During a pre-trip inspection, checking the fluid levels and leaks is crucial for ensuring the engine operates smoothly and safely. This check includes looking at the oil, coolant, and other vital fluids that lubricate and cool the engine. Low fluid levels can indicate potential problems like leaks or insufficient lubrication, which can lead to engine overheating or breakdowns while on the road.

Additionally, inspecting for leaks helps identify issues that may not be immediately visible and allows the driver to address them before the trip. Overall, ensuring that fluid levels are adequate and that there are no leaks helps maintain the vehicle's performance and reliability, which is essential for the safe operation of commercial vehicles.

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Battery charge level

Engine sound quality

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