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Practice test 4 of 10

Hawaii CDL — Air Brakes Practice Test 4

The Hawaii 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.An older vehicle's compressor governor cuts out at 120 psi. Under the manual's alternate rule for older vehicles, the visible low air warning must come on before pressure falls below what level?
  2. 2.A driver keeps leaning on fading brakes instead of easing the load on them. Where does the manual say continued overuse can lead?
  3. 3.On the vehicle inspection test you check a belt-driven air compressor's belt for snugness. How much play at the center of the belt does the manual allow?
  4. 4.To test the low pressure warning signal, you shut the engine off with enough air that the warning is not showing. What must you switch on before pumping the pressure down?
  5. 5.The manual says a dead low pressure warning signal plays out differently depending on the kind of air system. Which pairing is right?
  6. 6.Your truck's air tanks have automatic drains. What does the manual say about draining those tanks by hand?
  7. 7.The ABS requirement reached one kind of air-braked vehicle a year before the rest. Which kind?
  8. 8.Brake shoes and linings pressing on the inside of a drum create friction that slows the vehicle. What else does that friction produce?
  9. 9.What have tests shown about front wheel skids caused by braking?
  10. 10.The low air pressure warning required on air-braked vehicles must be of what kind?

0 of 25 answered