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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. If you are being tailgated, you should:
avoid quick changes.
increase your following distance.
All of the above.
2. Parking brakes are:
not required on trailers.
required on all vehicles.
not required on commercial vehicles with air brakes.
3. If the ABS is not working:
you still have normal brake functions.
the vehicle will have no brakes.
the vehicle will have weak brakes.
4. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
pull off the road and stop immediately.
activate your hazard lights and drive to the nearest place where you can stop.
slow down and test your brakes.
5. The most common type of brake is the:
R-cam drum brake
G-cam disc brake
S-cam drum brake
6. Air tanks must be drained completely to:
remove all moisture and oil.
remove all the air.
pump water and compressor oil into the tanks.
7. To make the brakes work, air brakes use:
compressed air.
hydraulic air.
8. Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
It takes one half second or more for the air to flow through the lines to the brakes.
Stopping distance for vehicles with air brakes is made up of six different factors.
Air brakes use different brake drums.
9. If your ABS is not working:
the drive wheels will begin to spin, and you should take your foot off the accelerator.
you still have normal brake functions, and should drive and brake as you always have.
it will slow your truck to a halt and force you to pull over.
10. In some vehicles a modulating control valve may be used to:
apply the spring brakes gradually.
decrease the pressure in the brake system.
apply the front brakes.
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CA Air Brakes Test

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