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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 New Hampshire CDL knowledge test. The NH 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 New Hampshire CDL Manual. Take this NH CDL practice test now to prepare for the actual air brakes test!
1. What should you do to correct a drive-wheel braking skid?
Stop braking, turn the steering wheel quickly, push in the clutch, and countersteer.
Fully apply the brakes, turn the steering wheel quickly, push in the clutch, and countersteer.
Turn in the same direction as the skid.
None of the above.
2. Older trailers do not have spring brakes. If the air supply leaks away:
there will be no emergency brakes.
the trailer will stop normally.
the ABS won't work properly.
All of the above.
3. Supply pressure gauges tell you:
when the air pressure in the tanks falls below 60 psi.
when the pressure in the system drops below 60 psi.
how much air pressure you are applying to the brakes.
how much pressure is in the air tanks.
4. What factors can cause brakes to fade?
Dirt roads and in unpaved yards.
Slippery surfaces and shaded areas.
Gravel and tar.
Excessive heat and brakes out of adjustment.
5. Overloading a vehicle with cargo can have negative effects on all of the following except:
Speed control
Weight limits
6. If your vehicle has an alcohol evaporator, every day during cold weather, you should:
check the alcohol container and fill up as necessary.
fill it up with oil to prevent the pipes from freezing.
fill it up with oil to prevent alcohol from freezing.
ensure that compressed air usually has some water and some  compressor oil in it.
7. An Anti-lock Braking System (ABS):
keeps your wheels from locking up when you brake hard.
lets you drive faster.
increases your normal braking capability.
always shortens your stopping distance.
8. A low air pressure warning signal is required on:
Warning signals are optional.
all vehicles with air brakes.
all vehicles with air brakes built after 2009.
all vehicles with air brakes built after 2005.
9. If the air pressure gets too low:
you should set the parking brake.
ABS will help maintain vehicle control.
the brakes will not work.
the brakes will lock up.
10. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
"S" stands for "Shoes".
it is shaped like the letter "S".
it is a safe-driving brake.
it applies a "Shock" to the brakes.
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NH 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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