CDL AIR BRAKES PRACTICE TEST - MINNESOTA
16.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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50 to 75 psi
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10 to 20 psi
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100 to 120 psi
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17.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
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the speed of your vehicle to increase.
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the trailer emergency brakes to come on.
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the trailer spring brakes to come on.
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All of the above.
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18.
Your mirrors should be adjusted so that:
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the rear of the vehicle is visible in the mirror.
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no part of the vehicle is visible in the mirror.
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a part of the vehicle is visible in the mirror.
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more than half of the mirror shows the vehicle.
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19.
In air brake vehicles, the parking brake should be used:
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any time you park (with a few exceptions).
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when the spring brakes are on.
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to hold your speed while going downhill.
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as little as possible.
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20.
Most heavy duty vehicles use ___ air brake systems for safety.
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triple
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dual
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single
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reduced
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