Skip to main content
DMV Test Free
ENES

Practice test 5 of 10

Missouri CDL — Air Brakes Practice Test 5

The Missouri 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.At roughly what tank pressure does the governor tell the compressor to stop pumping (cut-out)?
  2. 2.With a dual air system, how much pressure should you build up in each system before you start driving?
  3. 3.Why is it a mistake to pump the brake pedal on and off without need?
  4. 4.What do air brakes depend on to operate the brakes?
  5. 5.When should you skip setting the parking brakes and use wheel chocks instead?
  6. 6.During ordinary driving, what does the service brake system do?
  7. 7.What does it indicate if the safety valve lets air escape?
  8. 8.If a system includes an alcohol evaporator, can you skip draining the tanks?
  9. 9.What is the benefit of a modulating control valve for the spring brakes?
  10. 10.On newer vehicles, how do you set the parking (spring) brakes?

0 of 25 answered