Arizona CDL Combination Test (AZ) 2026

4.9 out of 5 (73 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Prepare to ace your AZ CDL combination test with our comprehensive Arizona permit test practice resource. This AZ permit practice test is specifically designed to help you master the skills and knowledge needed for the combination vehicles endorsement. Our Arizona combination CDL practice test includes a range of multiple-choice questions that cover all the essential areas, such as coupling and uncoupling, pre-trip inspections, driving techniques, backing and maneuvering, and air brake systems. Each DMV practice test consists of 20 questions, requiring a minimum of 16 correct answers to pass. This structure ensures that you have a thorough understanding of critical topics, including the increased stopping distances required for combination vehicles due to their greater weight. This understanding is crucial for maintaining safety on the road and effectively handling the unique challenges presented by these larger, heavier vehicles. One of the standout features of our AZ practice permit test is the review process. After completing the combination vehicle test, you can go over your answers and review any hints and explanations for the questions you missed. This immediate feedback helps reinforce your learning and ensures you are well-prepared for the actual Arizona CDL combination test. Convenience is key, and our drivers permit practice test is available online 24/7. You can work on this AZ permit test practice at any time that fits your schedule, not just when a driving school is available. This flexibility allows you to study at your own pace, making the learning process more efficient and less stressful. Best of all, our CDL combination practice test is completely free. While there are many expensive paid practice tests out there, our Arizona CDL combination test offers just as many features and study opportunities as any paid counterpart. You'll get high-quality preparation without any cost, ensuring you are ready to pass your AZ combination CDL practice test with confidence. Whether you're a new driver or refreshing your skills, our Arizona practice permit test provides the perfect platform to succeed in obtaining your CDL combination vehicles endorsement. Start your preparation today and ensure you're ready to tackle the road safely and confidently.
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Sample Arizona Combination Test Questions

Question 1

Why must a combination-vehicle driver account for off-tracking during a turn?

  1. A It determines the vehicle's fuel economy
  2. B It prevents normal tread wear
  3. C It causes the rear wheels to follow a different path from the front wheels
  4. D It controls how the fifth wheel couples

Correct answer: C – It causes the rear wheels to follow a different path from the front wheels

The Arizona CDL manual uses the term off-tracking for the different paths followed by the front and rear wheels in a turn. Longer combinations off-track more, with the rear wheels of the last trailer usually tracking farthest inward. The driver must allow enough turning clearance to keep the rear of the vehicle away from curbs and pedestrians.

Source: Arizona Commercial Driver License Manual — § 6.1.6, “Turn Wide”

Question 2

Before backing under a semitrailer, which condition indicates that its height is correct?

  1. A The fifth wheel will pass completely below the kingpin
  2. B The kingpin is more than an inch above the fifth wheel
  3. C The bottom of the kingpin is level with the fifth-wheel plate
  4. D The tractor will raise the trailer slightly as it backs under

Correct answer: D – The tractor will raise the trailer slightly as it backs under

The Arizona coupling procedure says the trailer should be low enough for the tractor to raise it slightly while backing under. A trailer that is too high may not couple correctly, while one that is too low may be struck and damaged by the tractor. Adjust the landing gear until the proper height is reached.

Source: Arizona Commercial Driver License Manual — § 6.4.1, “Step 6. Check Trailer Height”

Question 3

During ordinary driving, should you apply the trailer hand valve before the foot brake to prevent a trailer skid?

  1. A No; this can make the trailer skid
  2. B Yes; it produces the least wheel slippage
  3. C Yes; it is the preferred straight-line braking method
  4. D Yes; it provides the best braking in curves

Correct answer: A – No; this can make the trailer skid

The trailer hand valve should not be used for normal braking because it operates only the trailer brakes and can cause the trailer to skid. The foot brake applies the brakes throughout the combination. Using the foot brake presents less danger of a trailer skid or jackknife.

Source: Arizona Commercial Driver License Manual — § 6.2.1, “Trailer Hand Valve”

Question 4

Which procedure tests the tractor protection valve?

  1. A Open both shutoff valves at the rear of the last trailer
  2. B Release the parking brakes and make a gentle tug test
  3. C Charge the trailer system, shut off the engine, and repeatedly press and release the brake pedal
  4. D Move the trailer air-supply control to emergency by hand

Correct answer: C – Charge the trailer system, shut off the engine, and repeatedly press and release the brake pedal

The Arizona CDL manual directs the driver to charge the trailer air system, shut off the engine, and repeatedly press and release the brake pedal. As tank pressure falls, the trailer air-supply control should pop out or move to emergency at the manufacturer's specified pressure, usually between 20 and 45 psi. This verifies that the tractor protection valve closes automatically.

Source: Arizona Commercial Driver License Manual — § 6.5.2, “Test Tractor Protection Valve”

Question 5

How should the tractor be positioned before it is backed under a semitrailer?

  1. A Approximately 12 degrees to one side
  2. B Offset so the kingpin reaches the driver's-side jaw first
  3. C Approximately 20 degrees to one side
  4. D Directly in front of and aligned with the trailer

Correct answer: D – Directly in front of and aligned with the trailer

Position the tractor directly in front of the trailer and verify alignment in both outside mirrors. Backing under at an angle can push the trailer sideways and damage its landing gear. The kingpin and fifth wheel should also be aligned before coupling continues.

Source: Arizona Commercial Driver License Manual — § 6.4.1, “Step 3. Position Tractor”

Question 6

What is the intended use of the trailer hand valve?

  1. A To add braking whenever the foot brake is used
  2. B To brake only when the trailer is fully loaded
  3. C To provide emergency braking while driving
  4. D To test the trailer brakes

Correct answer: D – To test the trailer brakes

The trailer hand valve, also called a trolley valve or Johnson bar, operates the trailer brakes separately. It should be used only when testing the trailer brakes. Using it during normal driving can lock the trailer wheels and increase the danger of a skid or jackknife.

Source: Arizona Commercial Driver License Manual — § 6.2.1, “Trailer Hand Valve”

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