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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 Montana CDL knowledge test. The MT 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 Montana CDL Manual. Take this MT CDL practice test now to prepare for the actual air brakes test!
1. To prevent rollover, you should:
place the cargo near the rear of the trailer.
keep the cargo as close to the ground as possible.
put the lightest parts of the cargo under the heaviest parts.
place the cargo near the front of the trailer.
2. To control your speed on a downgrade, you should:
use controlled braking.
coast in neutral.
use engine braking.
fully apply the brakes.
3. When should you be particularly careful about high winds?
When emerging from a tunnel
When going downhill
When driving in winter
When driving at night
4. When driving on slippery roads, you should NOT:
use the engine brake.
go slowly.
watch far enough ahead to keep a steady speed.
try to anticipate stops early.
5. Typically an air system is fully-charged at:
125 psi
25 psi
250 psi
75 psi
6. A low air pressure warning signal is required on:
all vehicles with air brakes built after 2005.
all vehicles with air brakesĀ built after 2009.
all vehicles with air brakes.
Warning signals are optional.
7. Distracted driving may be caused by _________ while driving.
maintaining constant speed
listening to music
All of the above.
8. If your vehicle catches fire, you should pull over:
near other vehicles.
at a service station.
in an open area.
near trees.
9. In some vehicles a modulating control valve may be used to:
apply the front brakes.
apply the parking brake.
apply the spring brakes gradually.
decrease the pressure in the brake system.
10. The total stopping distance for vehicles with air brake systems is made up of __ different factors.
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MT Air Brakes CDL Test

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