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Practice test 5 of 10

Texas CDL — Air Brakes Practice Test 5

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.Some air tanks with automatic drain valves also have electric heating devices. What are the heaters for?
  2. 2.One half of your dual air brake system suddenly loses pressure on the highway. What should you do?
  3. 3.Why should you avoid pressing the brake pedal down while the spring brakes are applied?
  4. 4.At 55 mph, roughly how much extra stopping distance does brake lag alone add for an air-braked vehicle?
  5. 5.The governor stops the compressor from pumping once tank pressure climbs to roughly what level?
  6. 6.The braking power of the spring brakes depends on what?
  7. 7.A driver takes the CDL skills test in a vehicle with an air-over-hydraulic brake system. Which restriction goes on the license?
  8. 8.What job does an alcohol evaporator perform in some air brake systems?
  9. 9.You park an air-braked truck and leave the cab to make a delivery. What does safe practice require you to do first?
  10. 10.Why should you drain the air storage tanks on a vehicle with manually operated drain valves at the end of each day of driving?

0 of 25 answered