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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. Weight that is loaded so there is a high center of gravity:
reduces the chance that the load will shift to the side or fall off.
makes a vehicle easier to handle.
causes greater chance of rollover.
All of the above.
2. The use of air brakes on a steep downgrade is only a supplement to:
the use of the parking brakes.
the braking effect of the engine.
the use of the "controlled braking" method.
the use of the spring brakes.
3. When the spring brakes are on, you should:
exceed the posted speed limit.
pump the brakes.
not push the brake pedal down.
press the accelerator.
4. The use of brakes on a steep downgrade is:
a supplement to the braking effect of the engine.
the main braking factor.
dangerous, and should be avoided at all costs.
much more effective than the engine braking effect.
5. In vehicles with air brakes, the brake pedal:
tells you how much pressure is in the air tanks.
let the air out of the spring brakes.
controls the air pressure applied to the brakes.
pumps air into the air storage tanks.
6. If your vehicle is hydroplaning, you should:
accelerate to get through the water as quickly as possible.
use the brakes to slow down.
release the accelerator and push in the clutch.
None of the above.
7. Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
It takes one half second or more for the air to flow through the lines to the brakes.
When driving vehicles with air brakes, the average perception distance increases from 400 feet to 2200 feet.
Stopping distance for vehicles with air brakes is made up of six different factors.
Air brakes use different brake drums.
8. The application pressure gauge:
tells you how much pressure is in the air tanks.
shows how much air pressure is being applied to the brakes.
protects the tank and the rest of the system from too much pressure.
stops the compressor from pumping air.
9. Air pressure should build up in a single air system, within about:
3 minutes.
10 minutes.
15 minutes.
1 minute.
10. Most heavy duty vehicles use ___ air brake systems for safety.
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MT CDL Air Brakes Test

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