South Dakota CDL — Air Brakes Practice Test

The South Dakota 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.

South Dakota 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
Grease or oil on a brake lining, pad, drum or disc reduces braking friction. What other danger does Section 11 say brake contaminants can create?
Test 2
25 questions · pass with 20
You are in the proper low gear on a long downgrade and have judged 30 mph to be your "safe" speed. Using the manual's braking technique, to about what speed do you slow before releasing the brakes?
Test 3
25 questions · pass with 20
Where does the manual say brake drums are found on an air-braked vehicle?
Test 4
25 questions · pass with 20
Which pair of braking methods does the manual give for emergency stops in an air-braked vehicle?
Test 5
25 questions · pass with 20
You are in the proper low gear on a long downgrade and have judged 30 mph to be your "safe" speed. Using the manual's braking technique, to about what speed do you slow before releasing the brakes?
Test 6
25 questions · pass with 20
Air brakes are really three braking systems. Which one puts the brakes on and lets them off as you work the brake pedal in ordinary driving?
Test 7
25 questions · pass with 20
You find that brakes fitted with automatic slack adjusters are out of adjustment. What does the manual recommend?
Test 8
25 questions · pass with 20
You fail South Dakota's Air Brakes Test at an exam station on a Tuesday morning. When is the earliest you can try again?
Test 9
25 questions · pass with 20
On the external inspection you check the brake lines and hoses. What does Section 11 say a loss of air pressure there may cause?
Test 10
25 questions · pass with 20
According to the manual, what should ABS let you do while you are braking hard?