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Practice test 10 of 10

Oklahoma CDL — Air Brakes Practice Test 10

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 large buses, at what pressure do the low pressure warning devices commonly activate?
  2. 2.The driver-operated front brake limiting valve was fitted on some vehicles built during which era?
  3. 3.On newer air brake vehicles, how do you apply the parking brakes?
  4. 4.Why is it important to drain the air storage tanks completely?
  5. 5.What is the job of an alcohol evaporator in some air brake systems?
  6. 6.With the foot brake fully applied and held, what is the largest acceptable one-minute pressure drop for a combination vehicle?
  7. 7.On tractors and straight trucks, spring brakes come fully on when air pressure falls into which range?
  8. 8.An air brake setup is really a combination of which three separate braking systems?
  9. 9.In a dual air system with the engine at operating rpm, air pressure should build within which range and time?
  10. 10.During inspection, a brake drum should be rejected if it has a crack longer than what?

0 of 25 answered