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Practice test 9 of 10

Ohio CDL — Air Brakes Practice Test 9

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.Air-brake truck tractors built on or after which date are required to have antilock brakes?
  2. 2.A visible low-air warning is required on air-brake vehicles. It must come on before tank pressure drops below what level?
  3. 3.What most commonly causes brakes to fade on a long downgrade?
  4. 4.What does a supply pressure gauge tell the driver?
  5. 5.For other air-brake vehicles such as trucks, buses, trailers, and converter dollies, ABS is required on those built on or after what date?
  6. 6.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:
  7. 7.As the compressor fills the tanks, at roughly what pressure does the governor shut the compressor off (the "cut-out" point)?
  8. 8.How large a crack in a brake drum is allowed before the drum is considered unsafe?
  9. 9.How do spring brakes actually hold a parked truck in place?
  10. 10.On a trailer equipped with ABS, where is the yellow malfunction lamp located?

0 of 25 answered