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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 using a fire extinguisher, you should stay:
as far away from the fire as possible.
at whatever distance you think is safe.
as close to the fire as possible, without getting burnt.
at least 10 feet away from the fire.
2. Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
50 psi
150 psi
100 psi
35 psi
3. When coupling, you should:
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the trailer wheels are not chocked.
make sure the sliding fifth-wheel is locked.
make sure the trailer kingpin is bent.
4. Why must air tanks be drained?
The alcohol evaporator might stop working.
The water can freeze in cold weather and cause brake failure.
Your transmission fluid may drain out.
There might not be enough antifreeze in the system.
5. To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
turn off the engine, release the parking brake
check the air compressor's drive belt, chock the wheels
put alcohol into the air system, run the engine at a fast idle
release the parking brake, leave the engine running
6. In newer vehicles with air brakes, you put on the parking brake:
moving the orange push-pull lever to the right.
using a P-shaped, yellow control knob.
using a diamond-shaped, yellow, push-pull control knob.
placing the transmission in Park.
7. With the controlled braking method, you:
apply the brakes as hard as you can without locking the wheels.
apply the brakes all the way and release brakes when the wheels the lock up.
push down on the brake pedal as hard as you can so that the wheels the lock up.
None of the above.
8. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
20 to 45 psi.
55 to 74 psi.
30 to 35 psi.
5 to 15 psi.
9. Before transporting sealed loads, you should check that:
the load can be inspected.
the seal numbers match the placard numbers.
the load is properly secured.
All of the above.
10. Air brakes are 3 different braking systems: service brake, parking brake, and _______ brake.
air storage brake
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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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