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Utah CDL — Air Brakes Practice Test 1

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.Air-brake truck tractors must have antilock brakes if built on or after which date?
  2. 2.Why should you avoid pressing the brake pedal while the spring brakes are already applied?
  3. 3.On the application pressure gauge, needing more and more pressure to hold a steady speed points to what?
  4. 4.Other air-brake vehicles such as trucks, buses, and trailers must have ABS if built on or after when?
  5. 5.When is it a bad idea to set the parking brakes right after coming down a steep grade?
  6. 6.What is the defect most often found during roadside inspections?
  7. 7.For an average driver at 55 mph in good conditions, an air-brake vehicle's total stopping distance is about what?
  8. 8.What most commonly causes air brakes to fade on a long descent?
  9. 9.What is the 'wig wag' found on some air-brake vehicles?
  10. 10.During stab braking, when should you reapply the brakes after releasing them?

0 of 25 answered