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Practice test 5 of 10

Utah CDL — Air Brakes Practice Test 5

The Utah 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.If the low-air-pressure warning comes on while you are driving, what should you do?
  2. 2.What does a supply pressure gauge tell the driver?
  3. 3.Which of these is required equipment on every vehicle with air brakes?
  4. 4.On an older vehicle with a front brake limiting valve, where should the cab control stay for full stopping power?
  5. 5.Since which year have all newly built vehicles come with automatic slack adjusters?
  6. 6.For an average driver at 55 mph in good conditions, an air-brake vehicle's total stopping distance is about what?
  7. 7.During the final air-brake check, at about what pressures should the governor cut the compressor in and out?
  8. 8.What do air brakes rely on to actually apply the brakes?
  9. 9.Some buses carry a second, separate air tank tied to dual parking control valves. What is that reserve tank for?
  10. 10.What most commonly causes air brakes to fade on a long descent?

0 of 25 answered