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Practice test 10 of 10

Texas CDL — Air Brakes Practice Test 10

The Texas 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.What job does an alcohol evaporator perform in some air brake systems?
  2. 2.You are stab braking in an emergency. After the wheels lock and you release the pedal, when do you apply the brakes fully again?
  3. 3.While driving down a long hill, you notice you must push the pedal harder and harder to get the reading shown on the application pressure gauge to hold the same speed. What does this increasing application pressure tell you?
  4. 4.During inspection you check push rod travel on an s-cam brake with a manual slack adjuster. When you pull hard on the push rod, about how much movement means the brake needs adjustment?
  5. 5.The yellow ABS malfunction lamp stayed lit after the start-up bulb check and is still on as you cruise down the highway. What does that tell you?
  6. 6.You want a Texas CDL with no air brake restriction. Which pair of requirements must you meet?
  7. 7.On newer air-braked vehicles the parking brake control is a yellow, diamond-shaped knob. On older vehicles, what might it look like instead?
  8. 8.What is the main cause of brake fade on a long, steep downhill run?
  9. 9.You are performing the static leakage test on a single vehicle: engine off, fully charged system, foot off the brake, parking brake released, and you time the pressure drop. What is the most the pressure may fall?
  10. 10.During the final air brake check, how do you make sure the parking brake is strong enough to keep the vehicle still?

0 of 25 answered