In a dual air brake system, either the front or rear brakes will not be fully operable if one of the air systems gets too low on pressure. If the air pressure in either tank gets too low while you are driving, you should exit the road and park as soon as possible.

Either the front or rear brakes will not be fully operable.

None of the brakes will work at all.

Either the front or rear brakes will not be fully operable.

There is usually no noticeable effect.

Brakes out of adjustment will fade before those that are properly adjusted. Brake adjustment must be checked frequently to help prevent brake issues.

Cause some of the brakes to overwork and malfunction.

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.

In an air brake system, air tank drains are used to remove water and compressor oil from the air tanks. When operating a drain, be sure to drain the tank completely.

Be used to drain the tanks completely.

Only be used when it is wet outside.

Be used to drain the tanks completely.

Air Brakes Endorsement Test | Idaho 2025 #2 Page 3 of 4

Train for FREE online with our Idaho 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 ID Class A/Class B driver license in 2025, 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 | Idaho 2025 #2 Page 3 of 4

13 . In a dual air brake system, if one air system is very low on pressure:

14 . Brakes out of adjustment will:

15 . An alcohol evaporator is especially important:

16 . Manual air tank drains should be:

17 . Air tank drains should:

18 . The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

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