Utah CDL — Air Brakes Practice Test

The Utah 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.

Utah 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
Air-brake truck tractors must have antilock brakes if built on or after which date?
Test 2
25 questions · pass with 20
Why should you avoid pressing the brake pedal while the spring brakes are already applied?
Test 3
25 questions · pass with 20
How does an air-brake system turn on the brake lights for drivers behind you?
Test 4
25 questions · pass with 20
You have driven through deep standing water and your brakes are soaked. What is the recommended way to dry them?
Test 5
25 questions · pass with 20
If the low-air-pressure warning comes on while you are driving, what should you do?
Test 6
25 questions · pass with 20
Why can brakes that are out of adjustment lead the other brakes to fade?
Test 7
25 questions · pass with 20
After you release the brakes during stab braking, how long can it take for the wheels to start rolling again?
Test 8
25 questions · pass with 20
On a newer air-brake vehicle, how do you set the parking brakes?
Test 9
25 questions · pass with 20
What can happen to drum brakes if they absorb more heat than they can handle?
Test 10
25 questions · pass with 20
Compared with a car's hydraulic brakes, how quickly do air brakes respond?