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Practice test 2 of 10

Utah CDL — Air Brakes Practice Test 2

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.Why should you avoid pressing the brake pedal while the spring brakes are already applied?
  2. 2.Only the trailer in your combination is equipped with antilock brakes. What should you expect while braking?
  3. 3.At operating rpm in a dual air system, how long should it take to raise pressure from 85 to 100 psi?
  4. 4.If your brakes are too hot to set the parking brakes safely, how should you secure the vehicle?
  5. 5.Setting the parking brakes on soaking-wet brakes in freezing weather can cause what?
  6. 6.Which of these is required equipment on every vehicle with air brakes?
  7. 7.The safety relief valve on the first air tank starts letting air escape. What does that tell you?
  8. 8.What is the defect most often found during roadside inspections?
  9. 9.On a newer air-brake vehicle, how do you set the parking brakes?
  10. 10.At 55 mph on dry pavement, roughly how much extra distance does air brake lag add?

0 of 25 answered