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Practice test 3 of 10

Ohio CDL — Air Brakes Practice Test 3

The Ohio 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.On a truck whose air tanks have manually operated drain valves, how often should you drain them?
  2. 2.During the walk-around, brake linings should be checked to make sure they are not:
  3. 3.On older trucks with a front brake limiting valve control marked "normal" and "slippery," where should the control usually be kept?
  4. 4.How does the manual say to test the service brakes at the start of a trip?
  5. 5.What is the purpose of an alcohol evaporator in some air brake systems?
  6. 6.During the final air-brake check, at roughly what pressures should the compressor cut in and cut out?
  7. 7.If air keeps leaking away, spring brakes on a tractor or straight truck will come fully on once pressure drops into what range?
  8. 8.When you test the low-pressure warning signal, it must come on before tank pressure falls below what level?
  9. 9.Holding the foot brake down firmly for one minute on a single vehicle, the air loss is too high if the gauge drops more than:
  10. 10.Air-brake truck tractors built on or after which date are required to have antilock brakes?

0 of 25 answered