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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. Why should you check your mirrors regularly to know where other vehicles are around you?
To flash the brake lights if you are being tailgated.
To know whether you can make a quick lane change in an emergency.
To move out of their way if they want to get past.
2. What is the best way to test the low air pressure warning signal?
step on and off the brake pedal while the engine is running.
Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
pump the brakes until the air pressure drops below 45 psi.
3. If air pressure does not build up fast enough:
you should put the parking brake on and gently pull against it in a low gear.
the pressure may drop too low during driving.
you should turn the electrical power on and step on and off the brake pedal.
4. If the air tanks are not drained:
the water can freeze in cold weather and cause brake failure.
the air pressure in the tanks is reduced.
your speed must be reduced to 5 MPH below your “safe” speed.
5. A passive railroad crossing is one that:
does not have any type of traffic control device.
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
has a traffic control device installed at the crossing to regulate traffic.
6. With the controlled braking method, you:
apply the brakes as hard as you can without locking the wheels.
push down on the brake pedal as hard as you can so that the wheels the lock up.
apply the brakes all the way and release brakes when the wheels the lock up.
7. Pressing and releasing the brake pedal unnecessarily can:
causes friction, which slows the vehicle.
let air out faster than the compressor can replace it.
apply more air pressure.
8. If your vehicle has an alcohol evaporator, every day during cold weather, you should:
fill it up with oil to prevent alcohol from freezing.
check the alcohol container and fill up as necessary.
fill it up with oil to prevent the pipes from freezing.
9. If the air pressure gets too low:
ABS will help maintain vehicle control.
the brakes will lock up.
the brakes will not work.
10. Distracted driving may be caused by _________ while driving.
listening to music
maintaining constant speed
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CA Air Brakes CDL Test

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