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Practice test 3 of 10

Washington CDL — Air Brakes Practice Test 3

The Washington 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.Which statement about ABS on an air brake vehicle is accurate?
  2. 2.Inside a drum brake, what actually slows the vehicle and generates heat?
  3. 3.What does a supply pressure gauge tell the driver?
  4. 4.In a dual air system running at operating rpm, how long should it take pressure to climb from 85 to 100 psi?
  5. 5.How can brakes that are out of adjustment lead to a loss of braking on a long hill?
  6. 6.During normal driving, what makes the service brakes apply and then let go?
  7. 7.On an older vehicle, putting the front brake limiting valve control in the 'slippery' position does what?
  8. 8.In a vehicle without ABS, what happens if you brake hard enough on a slick road to lock the steering wheels?
  9. 9.How do air brakes differ from hydraulic brakes in how quickly they respond?
  10. 10.What best describes a dual air brake system?

0 of 25 answered