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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. If you're feeling tired while driving you should:
eat something.
increase your speed to get to your destination quicker.
stop driving and get some rest.
drink coffee.
2. When you push the brake pedal down, air brakes work:
only when ABS is working.
after about 15 seconds.
after a short delay.
3. Vehicles with air brake systems take longer to come to a complete stop than vehicles with hydraulic brakes because of:
brake fading.
brake lag.
reaction distance.
tire pressure.
4. Emergency brakes are:
not required on buses.
required on all vehicles.
not required on doubles.
not required on commercial vehicles with air brakes.
5. The application pressure gauge shows:
how much pressure is in the air tanks.
how much pressure the relay valves should send to the trailer brakes.
how much air pressure you are applying to the brakes.
All of the above.
6. If you get stuck on railroad tracks, you should:
stay in the vehicle and call for help.
check the engine compartment quickly.
have a helper push your vehicle.
get out of the vehicle and away from the tracks.
7. If the ABS is not working:
you still have normal brake functions.
the vehicle will have weak brakes.
the vehicle will have no brakes.
None of the above.
8. Radial and bias-ply tires:
should be used together only when driving in packed snow.
should be used together only during bad weather.
should be used together.
should not be used together.
9. If your trailer starts to skid, you should:
keep the rear of your vehicle close to the curb.
use the trailer hand brake (if you have one) to straighten out the rig.
accelerate slightly.
release the brakes to get traction back.
10. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
It was built after March 1, 1998.
It has yellow ABS malfunction lamps.
Wheel speed sensor wires are coming from the back of the brakes.
The letters "ABS" are printed on the side of the steering wheel.
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PA Air Brakes CDL 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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