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Practice test 4 of 10

Oklahoma CDL — Air Brakes Practice Test 4

The Oklahoma 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 newer air brake vehicles, how do you apply the parking brakes?
  2. 2.When someone suddenly pulls out in front of you, how should you brake?
  3. 3.For an average driver at 55 mph in good conditions, the total stopping distance of an air brake vehicle is about how far?
  4. 4.Why is working the brake pedal up and down when you do not need to slow down a bad habit?
  5. 5.What does 'brake lag' refer to in an air brake system?
  6. 6.During stab braking, how long can it take for the wheels to start rolling again after you release the brakes?
  7. 7.While a vehicle is being driven, what holds the powerful springs of the spring brakes back?
  8. 8.During inspection, a brake drum should be rejected if it has a crack longer than what?
  9. 9.According to the manual, what is the most common defect found during roadside inspections?
  10. 10.What does a supply pressure gauge tell the driver?

0 of 25 answered