Illinois CDL Air Brakes & Pre-Trip Inspection Practice Test
Practice 25 CDL questions on air brake systems, pre-trip inspection procedures, and stopping distances for commercial vehicles in Illinois.
Mode:
Study mode: See the correct answer, hints, and detailed explanation after each question.
What this Illinois practice test covers
- Air brake system components — compressor, reservoirs, chambers, and valves
- Proper air brake testing procedures and minimum pressure thresholds
- Stopping distances for air-braked vehicles vs. hydraulic brakes
- Pre-trip inspection checklist covering engine, cab, coupling, and walk-around
The actual Illinois Secretary of State knowledge test has 35 questions, and you need at least 28 correct (80%) to pass. This practice test is based on the Illinois Rules of the Road. The test fee is $20. Tests are administered Computer-based at Secretary of State facility. Two parts: 15 traffic sign identification + 20 rules of the road..