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. Tanks must be drained regularly to remove this build-up.

Because compressed air contains some water which must be drained from the tanks

Because the air gets old and needs to be replaced

Because compressed air contains some water which must be drained from the tanks

To allow for a change in air pressure

To remove bad air from the tanks

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.

Opened to drain the tanks after each day.

The purpose of an Anti-Lock Braking System (ABS) is to prevent a vehicle's wheels from locking up when the driver brakes hard on a slippery surface.

Prevent your vehicle from accelerating when going uphill.

Air Brakes Endorsement Test | Utah 2026 #1 Page 2 of 4

Train for FREE online with our Utah 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 UT 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

Air Brakes Endorsement Test | Utah 2026 #1 Page 2 of 4

7 . During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

8 . If using air tanks with manually operated drains, how often should you drain the tanks?

9 . Why do you need to drain air tanks regularly?

10 . Manual air tank drains should be:

11 . In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

12 . ABS brakes:

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

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