Air Brakes #1
Air Brakes Endorsement Test | Arizona 2025 #1 Page 3 of 4
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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13 . An alcohol evaporator is especially important:
Some air brake systems contain an alcohol evaporator. This evaporator introduces alcohol into the system to help prevent ice from forming in cold weather.
14 . A wig wag is:
Vehicles with air brakes are required to be equipped with a low pressure warning device. A wig wag is a type of low air pressure warning device. This device drops a mechanical arm into the driver's view if the pressure in the tanks drops to a level between 55 and 75 psi.
15 . A slack adjuster should move no more than ____ from where it is attached to the push rod.
Before a trip, you should check each slack adjuster after parking, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure that they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.
16 . When parking, you should not use the parking brake if:
If your brakes are hot after coming down a steep grade, you should not use your parking brake when parking. Let your brakes cool before applying the parking brake or risk damaging the brakes.
17 . What color malfunction lamps do vehicles equipped with ABS have?
Anti-Lock Braking System (ABS) malfunction lamps are usually yellow. Even if the ABS isn't working properly, a driver will still have access to the vehicle's usual braking functions.
18 . What does an air compressor do in an air brake system?
In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor.
2025 Arizona | Frequently Asked Questions
A CDL Class B license in Arizona allows holders to operate single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or towing a vehicle not exceeding 10,000 pounds GVWR. This includes buses, farm labor vehicles, and any vehicle that transports hazardous materials. The license requires passing a general knowledge test and any relevant endorsement tests.
A Class B CDL license in Arizona allows the operation of single vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or towing a vehicle not exceeding 10,000 pounds GVWR. This includes straight trucks, large buses, segmented buses, farm labor vehicles, and any vehicles transporting hazardous materials.
To acquire a Class B CDL license in Arizona, you must be at least 18 years old (21 for interstate driving), possess a valid Arizona driver's license, pass a vision test, and pass the written knowledge test. You will also need to complete a commercial driver's license application and pay the necessary fees. Lastly, you must pass a road skills test in the type of vehicle you plan to drive.
In Arizona, you must be at least 18 years old to apply for a Class B Commercial Driver's License (CDL) for intrastate driving (within Arizona only). However, to drive interstate (across state lines) or to carry hazardous materials, you must be at least 21 years old.
Specific endorsements aren't necessary for a Class B CDL license but they can expand the types of vehicles you're allowed to operate. Endorsements include passenger (P), school bus (S), and hazardous materials (H). Each endorsement requires additional knowledge tests, and the hazardous materials endorsement requires a background check.
The Class B CDL skills assessment in Arizona includes three parts: a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving test. These assessments evaluate your ability to inspect your vehicle for safety, control the vehicle in various settings (like backing and turning), and drive safely in real-world traffic situations.
Yes, Class B CDL license holders can only drive vehicles designed to carry 24 passengers or more, including the driver, and single vehicles with a GVWR of 26,001 lbs or more. They cannot tow trailers more than 10,000 lbs. If they want to drive combination vehicles or tow larger trailers, they need a Class A CDL.
Yes, the Arizona Department of Transportation offers the written Class B CDL test in Spanish. However, federal regulations require that all CDL holders understand English well enough to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, you can request test accommodations for the Class B CDL written exam in Arizona if you have a disability. The Arizona Department of Transportation (ADOT) provides reasonable testing accommodations under the Americans with Disabilities Act. Contact your local Motor Vehicle Division office in advance to arrange these accommodations.
Yes, you can retake the Class B CDL written test in Arizona if you fail on your first attempt. There is generally a waiting period between attempts, usually one day. You will also need to pay a retesting fee each time you retake the test. It's recommended to study thoroughly before retesting to increase your chances of passing.