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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 Massachusetts CDL knowledge test. The MA 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 Massachusetts CDL Manual. Take this MA CDL practice test now to prepare for the actual air brakes test!
1.
The parking brake:
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should be used whenever you park.
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should be used when driving in bad weather.
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should be used when you need to apply the brakes firmly.
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All of the above.
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2.
If your truck catches fire, the first thing you should do is to:
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pull into a service station and call for help.
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pull off the road and park in an open area.
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get the vehicle off the road and park near other vehicles.
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get off the vehicle, open the hood and start shooting foam to keep the engine cool.
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3.
Most heavy-duty vehicles use:
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hydraulic brakes.
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solid brakes.
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air brakes.
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pressure brakes.
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4.
If air doesn't flow all the way to the back:
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a rollover is more likely.
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your brakes will not work properly.
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the trailer will tend to swing around.
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your lower fifth wheel may fall off.
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5.
The safety valve is usually set to open at:
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200 psi.
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75 psi.
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150 psi.
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100 psi.
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