Kansas CDL Combination Test (KS) 2026

4.8 out of 5 (49 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Prepare yourself thoroughly for the Kansas CDL combination endorsement with our Kansas CDL combination practice test. Designed to cover all critical areas, this Kansas practice driving test includes a comprehensive range of multiple-choice questions that are key to mastering the knowledge required for safe driving. You'll encounter questions focused on coupling and uncoupling, pre-trip inspections, driving techniques, backing and maneuvering, and air brake systems. Each Kansas CDL combination test consists of 20 questions, and you need at least 16 correct answers to pass. This ensures you gain a solid understanding of crucial topics such as the increased stopping distances required for combination vehicles due to their greater weight. Mastering these areas is vital for maintaining safety on the road and handling the unique challenges posed by larger, heavier vehicles. The beauty of our DMV practice test is its flexibility; you can attempt it as many times as necessary. This allows you to get comfortable with this set of questions before moving on to the next Kansas driver's license practice test. Each attempt helps reinforce your knowledge and build confidence, making the learning process both thorough and efficient. Accessibility is another strong suit of our Kansas driving test practice. Whether you're at home or on the go, you can easily access the test online via mobile, desktop, or mobile apps. This convenience means you can fit your study sessions into your schedule effortlessly, without the need to be tied to a specific location or device. At the end of each Kansas CDL combination practice test, you will receive a detailed summary of your performance. This summary highlights the questions you answered incorrectly, along with the correct answers, providing a valuable learning tool to help you improve with each attempt. This immediate feedback is designed to enhance your learning experience, ensuring you understand your mistakes and know the correct information moving forward. Take full advantage of our combination vehicle test to prepare yourself thoroughly. The road to obtaining your CDL combination endorsement is paved with knowledge and practice, and our Kansas CDL combination test is here to guide you every step of the way.
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Sample Kansas Combination Test Questions

Question 1

Why must the trailer hand valve not be used to hold a parked trailer?

  1. A Air may leak away and release the brakes on a trailer without spring brakes
  2. B It places excessive weight on the trailer tires
  3. C It prevents the air compressor from operating
  4. D It closes the fifth-wheel locking jaws

Correct answer: A – Air may leak away and release the brakes on a trailer without spring brakes

The Kansas manual warns that air applied through the trailer hand valve can eventually leak away. On a trailer without spring brakes, that loss of pressure can release the brakes and allow movement. Use the parking brakes when parking. If the trailer has no spring brakes, chock its wheels to keep it from moving.

Source: Commercial Driver’s License Manual – Modernized Testing System — § 6.2.1, “Trailer Hand Valve”

Question 2

Poor weight balance can make a commercial vehicle unsafe to handle. True or false?

  1. A True
  2. B False

Correct answer: A – True

Cargo must be distributed to provide safe weight balance. Too much weight on the steering axle can make steering difficult, while too little front-axle weight can reduce steering control. Too little weight on the drive axles can cause poor traction and wheel spin. A high or unevenly placed load also increases rollover and cargo-shift risks.

Source: Commercial Driver’s License Manual – Modernized Testing System — § 3.2.4, “Balance the Weight”

Question 3

Which trailer air line carries pressure controlled by the foot brake?

  1. A The emergency air line
  2. B The service air line
  3. C The shut-off valve line
  4. D The glad-hand vent line

Correct answer: B – The service air line

The service air line carries the pressure signal used to apply the trailer service brakes. Its pressure changes according to how hard the driver presses the foot brake or operates the trailer hand valve. The service line acts through relay valves, allowing air from the trailer tanks to apply the trailer brakes. The emergency line instead supplies the trailer tanks and controls the emergency brakes.

Source: Commercial Driver’s License Manual – Modernized Testing System — § 6.2.4, “Trailer Air-lines”

Question 4

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

  1. A It determines the vehicle’s fuel consumption
  2. B It prevents wear on the fifth wheel
  3. C The rear wheels follow a different, more inward path
  4. D It changes the trailer’s coupling height

Correct answer: C – The rear wheels follow a different, more inward path

The Kansas manual describes off-tracking as the difference between the paths of the front and rear wheels during a turn. The trailer’s rear wheels travel farther to the inside, and longer combinations off-track more. The driver must steer the front end wide enough to keep the rear wheels from striking curbs, pedestrians, or other objects. The entire turn must still be made with proper lane control.

Source: Commercial Driver’s License Manual – Modernized Testing System — § 6.1.6, “Turn Wide”

Question 5

What happens if the trailer’s emergency air line loses pressure while the combination is moving?

  1. A The trailer service brakes are released
  2. B The compressor immediately increases engine speed
  3. C Only the trailer hand valve stops working
  4. D The trailer emergency brakes apply and the tractor protection valve closes

Correct answer: D – The trailer emergency brakes apply and the tractor protection valve closes

Loss of pressure in the emergency or supply line causes the trailer emergency brakes to apply. It also causes the tractor protection valve to close, preventing further air loss from the tractor. A broken emergency hose or a trailer separation can produce this pressure loss. Emergency-brake application may cause a loss of vehicle control.

Source: Commercial Driver’s License Manual – Modernized Testing System — § 6.2.4, “Emergency Air-line”

Question 6

After connecting the trailer air lines, how should you initially check that the brakes apply and release?

  1. A Accelerate rapidly while watching the gauges
  2. B Apply and release the brakes while listening for brake movement and escaping air
  3. C Turn the steering wheel fully in both directions
  4. D Check only the trailer’s exterior mirrors

Correct answer: B – Apply and release the brakes while listening for brake movement and escaping air

The Kansas coupling procedure directs the driver to supply air to the trailer and wait for normal pressure. Shut off the engine, apply and release the trailer brakes, and listen for the brakes to move and for air to escape upon release. Also watch the pressure gauge for signs of major air loss. Additional checks are still required before driving.

Source: Commercial Driver’s License Manual – Modernized Testing System — § 6.4.1, “Step 8. Supply Air to Trailer”

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