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Practice test 8 of 10

Illinois CDL — Air Brakes Practice Test 8

The Illinois CDL — Air Brakes knowledge test has 25 questions; you need 20 correct (80%) to pass.

This practice test follows that format: 25 questions, pass with 20 correct. Answer every page, then grade it to see the answers and explanations.

Questions 1–10 of 25

  1. 1.When you check the governor, at roughly what pressures should the compressor start and stop pumping?
  2. 2.An air brake arrangement actually combines three distinct braking systems. Which set correctly names them?
  3. 3.In a dual air system at operating rpm, air pressure should climb from 85 to 100 psi within about how long?
  4. 4.Which description matches the 'stab braking' emergency method?
  5. 5.On a tractor or straight truck, spring brakes come fully on in what pressure range, and what should you do beforehand?
  6. 6.Drum brakes slow the vehicle through friction and heat. What can excessive heat do to them?
  7. 7.How do you verify that the parking brake will hold?
  8. 8.On a system with an alcohol evaporator but no automatic drains, what must still be done each cold-weather day?
  9. 9.While you are driving normally, what keeps the strong springs of the spring brakes from applying the brakes?
  10. 10.Pressing the brake pedal (the foot or treadle valve) down harder has what effect?

0 of 25 answered