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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 California CDL knowledge test. The CA 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 California CDL Manual. Take this CA CDL practice test now to prepare for the actual air brakes test!
1. Controlled braking:
must be used when you need to turn sharply while braking.
involves locking the wheels and then releasing the brakes.
can be used to keep your vehicle in a straight line and allow you to turn if necessary.
2. If you are feeling sleepy, you should:
get some coffee.
pull off the road and rest.
slow down.
3. As part of the final air brake check, you should:
Check air compressor governor cut-in and cut-out pressure.
Test air leakage rate.
All of the above.
4. When the low air pressure warning light and buzzer first come on, you should:
speed up to restore pressure.
downshift and slow down.
bring the vehicle to a safe stop right away.
5. When meeting an oncoming vehicle at night, if the other driver does not put their low beams on, you should:
"get back at the other driver" by putting your own high beams on.
slow down and look straight ahead in your lane.
look slightly to the right to avoid looking directly at the lights of the oncoming vehicle.
6. Which of the following statements is true?
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
Poor cargo ventilation is a common cause of fire.
7. When you make a quick lane change, the crack-the-whip effect can:
make it harder to turn without skidding.
improve your traction.
turn the trailer over.
8. The air compressor is connected to:
the engine.
the transmission.
the radiator.
9. Overloading a vehicle with cargo can have negative effects on all of the following except:
Weight limits
10. When driving in a construction zone, if a construction worker is near the road, you should:
come to a complete stop.
further reduce your speed.
maintain a constant speed.
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CA CDL Air Brakes Test

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