Class 4 Commercial Driver Practice · Question
Which of the following exhaust system issues is considered a major defect that requires taking the vehicle out of service immediately?
Exhaust leaks under the cab or passenger compartment are extremely dangerous as they can allow carbon monoxide to enter the cabin. This is a grounds-for-rejecti
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Question: Which of the following exhaust system issues is considered a major defect that requires taking the vehicle out of service immediately?
Answer options:
- Black smoke from the tailpipe during acceleration
- A missing muffler clamp that doesn't cause a leak
- Condensation dripping from the tailpipe on a cold day ✅ An exhaust leak under the passenger compartment or cab
Correct answer: An exhaust leak under the passenger compartment or cab
Explanation: Exhaust leaks under the cab or passenger compartment are extremely dangerous as they can allow carbon monoxide to enter the cabin. This is a grounds-for-rejection defect.
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Question explanations
- What should you do if your accelerator pedal sticks while you are driving?
- What type of information should a Class 4 driver generally NOT include in their daily trip records or logbook
- When operating a taxi or small bus, when are you required to ensure passengers are using seatbelts?
- What is the correct procedure for a small bus driver approaching an uncontrolled railway crossing?
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