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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 Minnesota CDL knowledge test. The MN 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 Minnesota CDL Manual. Take this MN CDL practice test now to prepare for the actual air brakes test!
1.
When confronted by an aggressive driver, you should:
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avoid eye contact.
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make every attempt to get out of their way.
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call the police, if you have a cell phone and can do it safely.
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All of the above.
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2.
Radial and bias-ply tires:
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should be used together only during bad weather.
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should not be used together.
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should be used together only when driving in packed snow.
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should be used together.
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3.
If the safety relief valve in the air brake system releases air:
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this will supply more power to the drive wheels.
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this will supply more power to the brakes.
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the valve is fully operational.
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something is wrong.
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4.
How many reflective triangles/emergency reflectors should you carry?
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4
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2
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1
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3
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5.
If your vehicle catches fire, you should pull over:
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in an open area.
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near trees.
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at a service station.
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near other vehicles.
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6.
Service brakes should:
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only be checked by a mechanic.
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always be checked before applying the brakes.
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be checked before each trip.
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All of the above.
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7.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ the width of the friction area.
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3/5
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1/2
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9/10
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1/4
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8.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute are ___ psi for single vehicles and ___ psi for a combination of 2 vehicles.
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4; 5
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3; 4
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3; 2
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5; 6
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9.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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left and right.
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normal and slippery.
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wet and dry.
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high and low.
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10.
Why should you check your mirrors regularly to know where other vehicles are around you?
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To better assess your own speed.
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To move out of their way if they want to get past.
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To know whether you can make a quick lane change in an emergency.
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To flash the brake lights if you are being tailgated.
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