Skip to main content
DMV Test Free
ENES

Practice test 4 of 10

North Dakota CDL — Air Brakes Practice Test 4

The North Dakota 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.Your tractor has a dual air brake system and is hooked to a trailer. Which of the two systems does the manual say supplies air to the trailer?
  2. 2.Compressed air usually carries some water and compressor oil. Where does the manual say they tend to collect, and what is fitted there?
  3. 3.The manual tells drivers to brake the same way whether or not the vehicle has ABS, with one exception. What is the exception?
  4. 4.Your air brake system has an alcohol evaporator. During cold weather, how often does the manual say to check the alcohol container and fill it as needed?
  5. 5.Among North Dakota's numbered tips for preparing for the CDL road test, what does the manual say you must do to avoid an "airbrakes" restriction?
  6. 6.The ABS requirement for air-braked vehicles took effect on two different dates. Which vehicles does the manual say came first?
  7. 7.A modulating control valve lets the driver bring the spring brakes on gradually, harder the farther the lever is moved. What does the manual say this is for?
  8. 8.The manual says never to leave your vehicle unattended without doing one of two things. Which pair is it?
  9. 9.According to the manual, how may an air compressor be cooled?
  10. 10.The manual says tractor and straight truck spring brakes come fully on somewhere between 20 and 45 psi. What narrower range does it give as typical?

0 of 25 answered