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Practice test 3 of 10

Utah CDL — Air Brakes Practice Test 3

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.How does an air-brake system turn on the brake lights for drivers behind you?
  2. 2.A manual slack adjuster probably needs adjusting if it moves more than about how much at the push-rod connection?
  3. 3.Why can a heavily loaded truck roll a long way before stopping once the spring brakes come on?
  4. 4.On a newer air-brake vehicle, how do you set the parking brakes?
  5. 5.Compared with a car's hydraulic brakes, how quickly do air brakes respond?
  6. 6.Your truck has a modulating control valve for the spring brakes. How should you use it when you park?
  7. 7.What do air brakes rely on to actually apply the brakes?
  8. 8.With the engine off and the parking brake released, a single vehicle's air-loss rate should stay under what?
  9. 9.Only the trailer in your combination is equipped with antilock brakes. What should you expect while braking?
  10. 10.On large buses, the low-pressure warning devices commonly activate at about what pressure?

0 of 25 answered