Skip to main content
DMV Test Free
ENES

Practice test 6 of 10

North Dakota CDL — Air Brakes Practice Test 6

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.You are about to test the low pressure warning signal in the Step 7 final air brake check. How does the manual have you set things up before stepping on and off the brake pedal?
  2. 2.In stab braking you release the brakes when the wheels lock and reapply once they roll. After the release, how long does the manual say it can take the wheels to start rolling?
  3. 3.Your truck's air compressor has its own oil supply instead of sharing the engine's oil. What does the manual tell you to do?
  4. 4.North Dakota's manual gives the low air warning test in two versions of its vehicle inspection test. Before what pressure should the warning devices activate in each version?
  5. 5.Which of these is NOT one of the three braking systems that the manual says make up air brakes?
  6. 6.The manual gives a separate air pressure buildup standard for single air systems on pre-1975 vehicles. Which matches its typical requirement?
  7. 7.Some brake drums have openings that let you see the brake linings from outside the drum. What does North Dakota's vehicle inspection section say to check on that type of drum?
  8. 8.A bus with dual parking control valves has lost its main air pressure, and the driver pushes in the spring-loaded control to release the spring brakes and move. What happens when the driver lets go of that control?
  9. 9.North Dakota's manual says Class A, B and C drivers are restricted from air-brake-equipped commercial vehicles until they pass a knowledge test on air brakes plus a skill test. What kind of vehicle does it say the skill test must be taken in?
  10. 10.North Dakota's air brake check tells you to "fan off" the air pressure with the engine off and the key on. What does fanning off mean?

0 of 25 answered