Air Brakes #1
Air Brakes Endorsement Test | Arizona 2025 #1
Train for FREE online with our Arizona CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a AZ Class A/Class B driver license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.
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1 . While operating on a downgrade, you should brake until you reach a speed that is:
While driving downhill, you should hold down the brake pedal until your vehicle reaches a speed 5 mph below your safe speed, then release the brake pedal. Repeat this process.
2 . What can happen if the air pressure gets too low in an air brake system?
Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low.
3 . When an S-cam turns inside a brake drum, the S-cam:
When a brake pedal is pressed and the S-cam is turned, the S-cam presses the brake shoes against the inside of the brake drum. This causes friction and will cause the vehicle to slow.
4 . Manual air tank drains should be:
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Manually operated air tank drains must be opened daily to remove this build-up.
5 . Having ABS on only one axle:
If you have an Anti-Lock Braking System (ABS) equipped on only the tractor, only the trailer, or only one axle, you will still have more control over the vehicle when braking than you would without ABS. You should brake normally.
6 . During an applied leakage test, what is the maximum leakage rate that is safe for a single vehicle with air brakes?
It is important to know the maximum air loss rate that is safe for your specific vehicle. A single vehicle with air brakes should have a leakage rate no higher than 3 psi in a minute during an applied leakage test.
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2025 Arizona | Frequently Asked Questions
A Commercial Driver's License (CDL) Class A in Arizona is a license that allows the holder to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, provided the towed vehicle is heavier than 10,000 pounds. It typically covers vehicles like tractor-trailers, truck and trailer combinations, and flatbeds.
A Class A CDL license in Arizona permits the holder to operate a variety of vehicles such as tractor-trailers, truck and trailer combinations, tank vehicles, livestock carriers, and flatbeds. The key criteria is that the vehicle or combination of vehicles must have a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, with the towed vehicle exceeding 10,000 pounds.
To obtain a Class A CDL license in Arizona, you must be at least 18 years old (21 for interstate driving), hold a valid Arizona driver's license, pass a vision exam, and successfully complete a written knowledge test. Additionally, you'll need to pass a skills test which includes a pre-trip vehicle inspection, a basic controls test, and an on-road driving exam.
In Arizona, you must be at least 18 years old to qualify for a Class A CDL license for intrastate driving (within Arizona only). However, if you plan to drive interstate (across state lines), or carry hazardous materials, you must be at least 21 years old.
Specific endorsements are not required for a Class A CDL license, but they can expand your driving opportunities. Endorsements like Hazmat (H), Tank Vehicle (N), Passenger (P), and School Bus (S) require additional tests. These endorsements allow drivers to operate special types of commercial vehicles or transport specific types of goods.
The Class A CDL skills test in Arizona encompasses three main parts. First is the pre-trip vehicle inspection, where applicants must demonstrate knowledge of the vehicle and its parts. The second part is a basic controls test, which assesses fundamental driving skills. The final part is an on-road driving exam, testing the applicant's ability to safely operate the vehicle in various traffic conditions.
Yes, there are limitations. A Class A CDL holder in Arizona can only operate vehicles they are specifically endorsed for. They must also adhere to federal hours of service regulations and maintain a logbook of their driving hours. Additionally, they cannot drive if their blood alcohol concentration is 0.04% or higher, which is stricter than the limit for non-commercial drivers.
Yes, it is possible. In Arizona, the written Class A CDL test is available in several languages besides English. However, federal regulations require that all commercial drivers demonstrate proficiency in English to ensure they can understand traffic signs, signals, law enforcement officers and emergency personnel. Therefore, you should have enough command of English for safety on the road.
Yes, you can request accommodations for the Class A CDL written test in Arizona if you have a disability. The Arizona Department of Transportation (ADOT) complies with the Americans with Disabilities Act (ADA) and provides reasonable accommodations such as providing a sign language interpreter, reader, or enlarged print. Contact ADOT's Civil Rights Office for more information.
Yes, you can retake the Class A CDL written test in Arizona if you don't pass on your first attempt. However, you must wait a minimum of one day before retaking the exam. If you fail three times, you'll need to pay a new application fee. It's recommended to study thoroughly to increase your chances of passing on the next attempt.
