2025 Illinois Cdl Air Brakes - Test 1
The following questions are from real Illinois CDL practice tests. After selecting the answer, you can see the explanation. After confirming, click "Next" to jump to the next question.
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1. When about to drive a vehicle with a dual brake system, a driver should:
Let the vehicle warm up to ensure the fuel reaches the engine.
Wait for air pressure to build in both the primary and secondary systems.
Begin driving just after the engine starts.
Pump the pedal about 20 times to build pressure, then begin driving.
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Key Data
Number of Tests: 18
Number of Question: 25
Passing Score: 20
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