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Practice test 5 of 10

Delaware CDL — Air Brakes Practice Test 5

The Delaware 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.Front brake limiting valves on older trucks were meant to make front-wheel skids less likely on slick roads. What does the manual say they actually do?
  2. 2.On s-cam brakes, what pulls the brake shoes clear of the drum once you take your foot off the pedal?
  3. 3.You plan to pull a trailer that has air brakes. Besides the Air Brakes section, which part of the Delaware manual are you told to read?
  4. 4.You pass the air brakes knowledge test, then take your Delaware skills exam in a truck that has no air brakes. What goes on your CDL?
  5. 5.Pressure in your air tanks has dropped to about 100 psi, and the governor lets the compressor go back to pumping. What does the manual call this pressure level?
  6. 6.What does an application pressure gauge tell you?
  7. 7.Your brakes are well out of adjustment. According to the manual, which brakes will not work right?
  8. 8.On your walk-around, you look over the air hoses that run to the brake chambers. What are you checking for?
  9. 9.A pickup cuts across your lane with little warning, and your instinct is to hit the brakes. When does the manual call that a good response?
  10. 10.A modulating control valve lets the driver bring the spring brakes on gradually. Why does the manual say it works that way?

0 of 25 answered