Illinois CDL Practice Test: Air Brakes - Test 2020

(From the 2020 Illinois CDL Handbook)
Number of tests: 34
Number of questions: 30
Passing score: 80

Directions: To obtain this endorsement required to drive a vehicle with air brakes, applicants must pass a 20-question test. And to pass the test, applicants must score at least 80%. Test questions are from the Illinois Commercial Driver Handbook. The School Bus endorsement can be used with the Class A, B, or C CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at Illinois DMV locations.

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1. A dual air brake system:

2. Having ABS on only one axle:

3. What part of the truck is the air compressor connected to?

4. What kind of force must emergency brakes use?

5. If the vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be in?

6. When going down a steep downgrade,

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