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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. One way to prevent hydroplaning is to:
use the controlled braking method.
take curves at higher speeds.
have less than 4/32 inch tread depth in every major groove on front tires.
make sure you have enough tread on your tires.
2. Before starting down a hill, you should:
look for an escape route.
slow down and shift to a lower gear.
release the accelerator and shift to Neutral at the same time.
apply the brakes hard.
3. Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
When driving vehicles with air brakes, the average perception distance increases from 400 feet to 2200 feet.
Stopping distance for vehicles with air brakes is made up of six different factors.
Air brakes use different brake drums.
It takes one half second or more for the air to flow through the lines to the brakes.
4. A low air pressure warning signal must come on when the air pressure in the tanks falls below:
60 psi.
100 psi.
15 psi.
10 psi.
5. Antilock brakes:
let you drive faster.
help you stop faster.
decrease your stopping distance.
None of the above.
6. The air storage tanks:
are used to hold compressed air.
are connected to the engine through gears or a v-belt.
stop the compressor from pumping air.
protects the tank and the rest of the system from too much pressure.
7. The trailer hand valve should:
never be used for parking.
never be used to test the trailer brakes.
be used in driving.
All of the above.
8. Which of the following statements is true?
Carrying a properly charged and rated fire extinguisher will help prevent fires.
Under-inflated tires will NOT cause a vehicle fire.
Poor cargo ventilation is a common cause of fire.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
9. When going down grades, you should:
downshift to a lower gear.
put the transmission in Neutral.
rely solely on engine braking to reduce your speed.
shift up.
10. The braking power of the spring brakes:
depends on the brakes being in adjustment.
is not affected by the condition of the service brakes.
is not affected by the air pressure level.
All of the above.
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PA 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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