Air Brakes Endorsement Test | Arizona 2026 #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 2026, 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.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . While operating on a downgrade, you should brake until you reach a speed that is:

5 mph below your safe speed.

10 mph below your safe speed.

15 mph below your safe speed.

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?

The brakes may squeak.

The brakes may stop working.

The brakes may be sluggish.

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:

Presses the brake shoes against the inside of the brake drum.

Presses the brake shoes against the brake linings.

Presses the brake linings against the wheel axles.

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:

Opened to drain the tanks after each day.

Left open while driving.

Sealed with glue.

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:

Can be dangerous.

Still allows you additional control when braking.

Slows the vehicle, but cannot stop it.

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?

10 psi in one minute

5 psi in one minute

3 psi in one minute

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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2026 Arizona | Frequently Asked Questions

In Arizona, to secure a CDL Doubles/Triples endorsement, you must first have a valid Commercial Driver's License (CDL). Then, you'll need to pass the Doubles/Triples endorsement knowledge test administered by the Arizona Department of Transportation. Studying the CDL manual and taking practice tests can help prepare for this exam.

To obtain a CDL Doubles/Triples license, you first need a valid Commercial Driver's License (CDL). You must then pass the Doubles/Triples endorsement knowledge test. Preparation can include studying the CDL manual, particularly sections on coupling and uncoupling and inspecting doubles and triples. Lastly, pay the required fees to the Arizona Department of Transportation.

While Arizona doesn't mandate specific training for a CDL Doubles/Triples endorsement, it's beneficial to have practical experience or training. Understanding how to handle these larger, more complex vehicles safely is crucial. You'll need to pass the Doubles/Triples Endorsement Test, so studying the CDL manual and possibly taking a preparation course could be helpful.

Yes, to obtain a CDL Doubles/Triples endorsement in Arizona, you must pass the Doubles/Triples endorsement knowledge test. This test assesses your understanding of specific rules and safety standards for operating these vehicles. Studying the CDL manual and taking practice tests can help you prepare for this exam.

The CDL Doubles/Triples endorsement test in Arizona is primarily a knowledge test, focusing on understanding safety rules and procedures rather than specific maneuvers. Key topics include coupling and uncoupling, inspecting doubles and triples, and managing the vehicles' size and weight. However, practical skills like maneuvering and controlling these large vehicles are crucial for safe operation on the road.

No, it is not permissible to operate double/triple trailers without a valid CDL Doubles/Triples endorsement in Arizona. Driving such vehicles without the proper endorsement is illegal and can result in serious penalties, including fines and suspension or revocation of your commercial driver's license.

The CDL Doubles/Triples endorsement can be added to your existing commercial driver's license. You do not need to initiate a new application for a separate license. However, you will need to pass the Doubles/Triples endorsement knowledge test and pay the appropriate fees to have this endorsement added to your CDL.

Yes, drivers with a CDL Doubles/Triples endorsement must adhere to specific limitations. For example, the maximum length for a trailer in a double/triple combination is 28.5 feet. Furthermore, drivers are restricted to hauling doubles/triples on designated highways and during specific hours of the day, as determined by state and federal regulations.

The maximum length for a trailer in a double/triple combination is 28.5 feet. In terms of weight, federal law allows a maximum gross vehicle weight of 80,000 pounds, but this can be influenced by the number and spacing of axles. However, states can set their own restrictions, so it's advisable to check with local authorities.

Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety regulations. These include maintaining a safe following distance, not exceeding speed limits, ensuring proper coupling and uncoupling of trailers, and conducting pre-trip inspections. Additionally, drivers must understand the high rollover risk associated with these trailers and the effects of "crack-the-whip" scenarios.