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Practice test 8 of 10

Wisconsin CDL — Air Brakes Practice Test 8

The Wisconsin 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.With the foot brake fully applied and held for one minute on a single vehicle, how much air loss is too much?
  2. 2.According to the manual, what is the most common brake defect found during roadside inspections?
  3. 3.Why should you avoid pressing and releasing the brake pedal for no reason?
  4. 4.What color is the ABS malfunction lamp on a tractor, truck, or bus?
  5. 5.On a newer air brake vehicle, how do you set the parking (spring) brakes?
  6. 6.In a dual system, what happens if one of the two systems loses most of its pressure?
  7. 7.When the low air pressure warning first activates, what is the correct action?
  8. 8.Someone pulls out ahead of you and you have room to stop. Besides slowing the vehicle, what should your hard braking accomplish?
  9. 9.Why is it risky to let the spring brakes set themselves instead of stopping under control first?
  10. 10.If the ABS on your vehicle stops working, what braking do you still have?

0 of 25 answered