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Practice test 2 of 10

Montana CDL — Air Brakes Practice Test 2

The Montana 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.In the air leakage rate test on the vehicle inspection test, you shut off the engine, release the brakes and press the foot brake all the way down. When does the manual's one-minute count begin?
  2. 2.The manual describes air brakes as three braking systems in one. What does it say the emergency brake system is built from?
  3. 3.You are about to park in freezing weather and your brakes are very wet. What does the manual suggest doing before you stop?
  4. 4.Your vehicle applies its spring brakes with a modulating control valve on the dash. How does the manual say to park it?
  5. 5.How do the brake lights come on in a vehicle with air brakes?
  6. 6.Your vehicle has air over hydraulic brakes, not full air brakes. According to the manual's list of knowledge tests, do you need to take the air brakes test?
  7. 7.During the emergency brake test on the vehicle inspection test, you are fanning off air in a vehicle whose valves are not the pop-out kind. How does the manual say you will know the parking or emergency brakes have applied?
  8. 8.In a wedge brake, what does the brake chamber push rod do?
  9. 9.A driver makes a habit of manually adjusting his truck's automatic slack adjusters every week. Besides hiding a mechanical problem, what does the manual say this routine is likely to cause?
  10. 10.With air brakes there is a short delay between pressing the pedal and the brakes working. About how long does the manual say the air takes to travel through the lines?

0 of 25 answered