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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. If you must stop on a one-way or divided highway, place your warning devices:
10 feet, 50 feet, and 150 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 100 feet, and 200 feet toward the approaching traffic.
50 feet, 100 feet, and 150 feet toward the approaching traffic.
2. If a load is placed on one side of the trailer:
the steering axle weight will be too light to steer safely.
a rollover is more likely.
making turns may be easier.
your brakes won't work.
3. When using a fire extinguisher, you should stay:
at least 10 feet away from the fire.
as far away from the fire as possible.
as close to the fire as possible, without getting burnt.
at whatever distance you think is safe.
4. Which of the following is not part of the air brake system?
Air storage tanks
Alcohol evaporator
Air compressor
Air filter
5. The braking power of the spring brakes:
is not affected by the condition of the service brakes.
is not affected by the air pressure level.
depends on the brakes being in adjustment.
All of the above.
6. The space under a heavily loaded vehicle can be very small. This can cause problems:
on dirt roads.
on unpaved yards.
when crossing railroad tracks.
All of the above.
7. The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.
8. In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
9. ABS brakes help you:
downshift before starting down a hill.
avoid wheel lock up.
find an escape route when the service brakes fail.
lock up the wheels in an emergency stop.
10. With the controlled braking method, you:
push down on the brake pedal as hard as you can so that the wheels the lock up.
apply the brakes all the way and release brakes when the wheels the lock up.
apply the brakes as hard as you can without locking the wheels.
None of the above.
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MT Air Brakes Test

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