Positioning the weight of a load on one side of a trailer may cause the trailer to lean to that side, increasing the risk of a rollover during turns and lane changes.

May add extra support during turns.

May be easier to steer during turns.

When coupling air brake hoses, you should make sure the proper pairs of gland hands are connected. They are sometimes color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.

Make sure to couple the proper glad hands.

Only couple one set of glad hands.

It is best to leave one glad hand loose.

When coupling air brake hoses, you should make sure the proper pairs of gland hands are connected. They are sometimes color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.

Couple together the proper glad hands.

Couple glad hands with any other glad hands.

Leave one pair of glad hand loose.

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

Releasing air with the brake pedal.

Pulling the yellow, diamond-shaped knob.

Releasing air with the brake pedal.

Combination Vehicles Practice Test | Utah 2026 #2 Page 3 of 4

Train for FREE online with our Utah CDL combination vehicle 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 UT combination 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 DMV requirements for issuing a combination license may vary from state to state.

Number of Question 30

Passing Score 25

Number of Tests 20

Combination Vehicles Practice Test | Utah 2026 #2 Page 3 of 4

17 . The service air line is attached to the:

18 . What is another name for the service line?

19 . A combination vehicle has:

20 . If a load is placed on one side of a trailer, the trailer:

21 . When coupling, you should:

22 . When coupling a trailer, you should:

23 . A driver should test the tractor protection valve by:

See the exact questions that will be on the 2026 DMV exam.

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