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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the South Dakota CDL knowledge test. The SD CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the South Dakota CDL Manual. Take this SD CDL practice test now to prepare for the actual air brakes test!
1. If the low pressure warning signal doesn't work:
you could lose air pressure and you would know it.
in dual systems the stopping distance will be decreased.
this could cause sudden emergency braking in a single-circuit air system.
None of the above.
2. Hydroplaning is more likely if:
tire pressure is low.
the road is wet.
tire tread is worn.
All of the above.
3. To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
If you don't pass the air brakes test, you can't get a CDL.
If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
All trucks have air brakes.
If you don't, you will only receive a CDL permit.
4. Empty trucks:
are higher than loaded trucks.
have less traction.
require greater stopping distances.
All of the above.
5. If the ABS is not working:
the vehicle will have weak brakes.
you still have normal brake functions.
the vehicle will have no brakes.
None of the above.
6. You should NOT use the parking brakes if:
the brakes are very hot.
the brakes are cold.
the brakes are too dry.
All of the above.
7. When should you downshift automatic transmissions?
When you want to go faster.
Watch your tachometer, and downshift when your engine reaches the top of the range.
When going down steep grades.
When you start to get drowsy.
8. When the air pressure is built up to governor cutoff, the air leakage rate for combination vehicles with the engine off and the foot brake fully applied should be less than_____ in one minute.
5 psi
2 psi
4 psi
3 psi
9. If you're feeling tired while driving you should:
drink coffee.
eat something.
increase your speed to get to your destination quicker.
stop driving and get some rest.
10. Antifreeze:
helps the engine under hot conditions as well as cold conditions.
helps the engine only when the temperature is below freezing.
helps the engine only under hot conditions.
doesn't help the engine in any way.
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SD CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Number of questions: 25
Correct answers to pass:20
Passing score:80%
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