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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. The use of air brakes on a steep downgrade is only a supplement to:
the use of the parking brakes.
the use of the spring brakes.
the braking effect of the engine.
the use of the "controlled braking" method.
2. Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary systems should be at least:
130 psi.
50 psi.
100 psi.
75 psi.
3. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
10, 100 and 200 feet
3, 15 and 45 feet
5, 25 and 50 feet
5, 50 and 500 feet
4. It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ the width of the friction area.
5. Weight that is loaded so there is a high center of gravity:
causes greater chance of rollover.
makes a vehicle easier to handle.
reduces the chance that the load will shift to the side or fall off.
All of the above.
6. What should you do to correct a drive-wheel braking skid?
Fully apply the brakes, turn the steering wheel quickly, push in the clutch, and countersteer.
Turn in the same direction as the skid.
Stop braking, turn the steering wheel quickly, push in the clutch, and countersteer.
None of the above.
7. Brakes out of adjustment can cause the other brakes to:
last longer.
work better.
overheat and fade.
apply more braking power.
8. If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?
Once a week.
At the end of each working day.
Every 4 hours.
At least once a month.
9. The parking brake:
should be used whenever you park.
should be used when driving in bad weather.
should be used when you need to apply the brakes firmly.
All of the above.
10. The alcohol evaporator:
eliminates the need for daily air tank drainage.
helps to reduce the risk of ice in air brake valves and other parts in cold weather.
ensures the coolant temperature gauge remains in the normal range.
shows how much air pressure you are applying to the brakes.
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PA CDL Air Brakes Test

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