Nebraska CDL — Air Brakes Practice Test
The Nebraska CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.
Or take one of 10 full-length practice tests
25 questions · pass with 20 correct. You get instant feedback and an explanation after every answer.
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The full-length test, with feedback and an explanation after every answer.
Nebraska CDL — Air Brakes practice tests
10 full-length practice tests, each with 25 questions and a pass mark of 20, like the real test. You see the answers and explanations after you grade.
- Test 1
25 questions · pass with 20
The modulating control valve some vehicles use to apply the spring brakes gradually is spring-loaded. What reason does the manual give for that?
- Test 2
25 questions · pass with 20
Which order matches how an s-cam brake applies after you press the pedal?
- Test 3
25 questions · pass with 20
You are driving a truck with a dual air system. The secondary gauge is sinking toward 55 psi while the primary still reads normal. What should happen, and what should you do?
- Test 4
25 questions · pass with 20
The manual calls air brakes a good, safe way to stop large and heavy vehicles. What two conditions does it attach to that statement?
- Test 5
25 questions · pass with 20
Overheated brake drums expand. What does the manual say that does to the brake shoes and linings?
- Test 6
25 questions · pass with 20
Which order matches how an s-cam brake applies after you press the pedal?
- Test 7
25 questions · pass with 20
A new mechanic makes four statements about the air compressor. Which one does NOT agree with the manual?
- Test 8
25 questions · pass with 20
The Step 7 check ends with a low-speed test of the service brakes. Why does the manual say this test is worth doing?
- Test 9
25 questions · pass with 20
Using controlled braking, you had to release the brakes because the wheels locked. When does the manual say to put them back on?
- Test 10
25 questions · pass with 20
What happens at the brakes when you push the brake pedal of an air-braked vehicle down harder?