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Practice test 9 of 10

South Dakota CDL — Air Brakes Practice Test 9

The South Dakota 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.On the external inspection you check the brake lines and hoses. What does Section 11 say a loss of air pressure there may cause?
  2. 2.How does the manual's final air brake check have you test the parking brake?
  3. 3.The manual compares the way an air-operated disc brake squeezes its disc to a familiar tool. Which one?
  4. 4.In the air leakage rate test on the vehicle inspection test, the gauge dips when you first press the foot brake all the way down. From what moment do you time the one-minute hold?
  5. 5.According to the manual, what should ABS let you do while you are braking hard?
  6. 6.In stab braking, a driver puts the brakes fully back on before the locked wheels have started rolling again. What does the manual say happens?
  7. 7.Which of these parts plays NO role in applying an s-cam drum brake?
  8. 8.Section 11's air warning device test names three low air warning devices. A buzzer and a light are two of them. What is the third?
  9. 9.You spot a crack in the friction surface of a brake drum. At what point does the manual say the drum is not acceptable?
  10. 10.What score does South Dakota require to pass the Air Brakes Test, like every other CDL knowledge test?

0 of 25 answered