MISSOURI CDL AIR BRAKES PRACTICE TEST
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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 Missouri CDL knowledge test. The MO 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 Missouri CDL Manual. Take this MO CDL practice test now to prepare for the actual air brakes test!
1.
Some vehicles have a separate air tank which can be used to:
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turn on the 4-way emergency flashers.
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release the spring brakes.
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hold the vehicle or combination of vehicles stationary.
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2.
If you must drive slowly, how should you alert following drivers?
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Flash your brake lights
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Turn on your taillights
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Use your emergency flashers if it is legal
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3.
Slack adjusters:
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regulate the distance between the rear wheels.
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regulate the distance that the air brake has to travel to apply friction to the wheel.
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should move more than one inch where the push rods attach to them.
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4.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/2
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1/3
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1/4
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5.
The safety valve is usually set to open at:
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100 psi.
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150 psi.
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200 psi.
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