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

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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