Skip to main content
DMV Test Free
ENES

Practice test 8 of 10

Indiana CDL — Air Brakes Practice Test 8

The Indiana 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.Why can you still apply the brakes several times even after the compressor has stopped pumping?
  2. 2.When should you NOT set the parking brakes, and instead chock the wheels to hold the vehicle?
  3. 3.On a tractor or straight truck, the spring brakes come fully on when air pressure drops into which range?
  4. 4.What does a supply pressure gauge tell the driver?
  5. 5.What is the main cause of brake fade on a long downgrade?
  6. 6.Which system engages and lets off the brakes each time you work the pedal during ordinary driving?
  7. 7.If one circuit of a dual air brake system loses most of its pressure, what should you expect?
  8. 8.Compared with hydraulic brakes, why do air brakes add 'brake lag' to the stopping distance?
  9. 9.Before driving a dual air brake vehicle, you should let the compressor build at least how much pressure in both systems?
  10. 10.If a truck's air compressor is lubricated by its own separate oil supply, what should the driver do before a trip?

0 of 25 answered