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UPGRADE TO CDL PREMIUM
1.
When the spring brakes are on, you should:
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press the accelerator.
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pump the brakes.
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exceed the posted speed limit.
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not push the brake pedal down.
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2.
With brake drums, if brakes become too hot:
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the air compressor will kick on to cool the brakes.
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the brakes will supply too much power to the drive wheels.
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your ABS will malfunction.
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the brakes may stop working.
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3.
Passive railroad crossings:
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should never be crossed using a CMV.
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usually have a person directing traffic.
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do not have traffic control devices.
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have at least one traffic control device.
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4.
To check the slack adjusters:
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
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park downhill and see if the vehicle rolls.
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None of the above.
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5.
Most heavy duty vehicles use ___ air brake systems for safety.
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single
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dual
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reduced
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triple
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6.
Pressing and releasing the brake pedal unnecessarily can:
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let air out faster than the compressor can replace it.
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causes all the air to be lost.
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causes friction, which slows the vehicle.
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apply more air pressure.
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7.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
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125 psi.
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250 psi.
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100 psi.
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450 psi.
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8.
Why should you check your mirrors regularly to know where other vehicles are around you?
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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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To move out of their way if they want to get past.
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To better assess your own speed.
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9.
The one-way check valve:
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keeps your wheels from locking up when you brake hard.
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supplies air to the trailer air tanks.
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keeps the axles in place.
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keeps air from going out if the air compressor develops a leak.
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10.
You can be sure that your vehicle is equipped with ABS:
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if the vehicle was manufactured after 2010.
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if the vehicle was manufactured after 2000.
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if your company requires the use of antilock brakes in its policies.
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if the vehicle was manufactured after 1998.
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