Illinois CDL Class A Knowledge Test 1

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When starting the engine of a truck with a trailer, how can you tell if the Anti-Lock Braking System (ABS) is not working?

The yellow light on the rear of the trailer will stay on. The red light on the trailer will flash three times and then stay on. All the rear lights on the trailer will flash and then shut off. The blue light near the driver's door will light.

Correct Answer:

The yellow light on the rear of the trailer will stay on.

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