A school bus driver who notices fluid leaks during pre-trip:
Correct. Identify what is leaking. Brake-fluid, fuel, or coolant leaks render the bus unsafe. Repair before service.
CDL Practice Question #477
Category: School Bus
Why this question matters
This question is one of 55 in our School Bus bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.