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Practice test 1 of 10

California CDL — Air Brakes Practice Test 1

The California 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.If your air tanks have manually operated drain valves, why must you drain them at the end of every driving day?
  2. 2.How should you use the brake pedal to make a normal stop in a vehicle with air brakes?
  3. 3.How do you test the service brakes during the final air brake check?
  4. 4.What is the correct way to confirm that the parking brake holds the vehicle?
  5. 5.Air brakes are really three braking systems in one. Which of them stops the vehicle if the brake system fails, using parts of the other two?
  6. 6.The first air tank the compressor fills is fitted with a safety relief valve. At about what pressure does this valve usually open?
  7. 7.During the air brake check, how do you test the low pressure warning signal?
  8. 8.Which type of foundation brake is found at the wheels of most heavy vehicles that use air brakes?
  9. 9.Any time you park a vehicle equipped with air brakes and leave it unattended, what should you do?
  10. 10.You are driving a vehicle with a dual air brake system and one of the two systems loses pressure. What should you expect, and what should you do?

0 of 25 answered