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Practice test 2 of 10

Kansas CDL — Air Brakes Practice Test 2

The Kansas 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.Only your tractor has ABS. During a hard stop, you see in the mirror that the trailer is starting to swing out. What should you do?
  2. 2.Your truck has a modulating control valve on the dash for applying the spring brakes. How do you use it when you park?
  3. 3.You're doing the applied-pressure leakage test on a tractor-trailer: engine off, parking brake and tractor protection valve released, foot brake held fully down for one minute. What drop on the gauge means the air loss is too high?
  4. 4.You're about to pull an old trailer built before ABS was required, and you can't tell whether it was fitted with ABS. What does the manual suggest looking for underneath it?
  5. 5.During a pre-trip inspection you suspect a truck's brakes have far too much slack. What is the main danger if that goes unfixed?
  6. 6.On an older single air brake system (pre-1975), the typical buildup check is 50 to 90 psi within 3 minutes. At what engine speed is that measured?
  7. 7.On an older air-braked truck, the yellow ABS malfunction lamp is still on as you creep out of the yard. Up to what point can the lamp on older systems normally stay lit?
  8. 8.In an emergency, you hand-adjust an automatic slack adjuster so you can get the truck to a repair shop. What should you expect afterward?
  9. 9.On a long downgrade you keep leaning on the service brakes even after they start to fade. Where can that lead?
  10. 10.Your trailer has ABS but your tractor does not. What does the trailer's ABS make less likely when you brake?

0 of 25 answered