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Practice test 2 of 10

New York CDL — Air Brakes Practice Test 2

The New York 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.The safety relief valve on an air tank is normally set to open at about 150 psi. If this valve ever releases air, what does that tell you?
  2. 2.Using the recommended downgrade braking method, you apply the brakes until you feel a definite slowdown. When do you release them?
  3. 3.Before driving a vehicle with a dual air brake system, you should wait until the gauges show at least what pressure in both the primary and secondary systems?
  4. 4.What is the root cause of brake fade on a long, steep downhill grade?
  5. 5.Some air compressors carry a separate oil supply instead of being lubricated by engine oil. What should you do before driving a vehicle with that kind of compressor?
  6. 6.How does an antilock braking system (ABS) affect your stopping distance in a hard stop?
  7. 7.One of the two systems in your dual air brake setup has become very low on pressure. How does that affect your braking?
  8. 8.As air is used and tank pressure drops, at approximately what pressure does the governor signal the compressor to begin pumping again?
  9. 9.Certain vehicles, buses among them, carry an extra air tank with its own spring-loaded control valve. What is that extra air supply for?
  10. 10.What information does the supply pressure gauge on the dash give the driver?

0 of 25 answered