The low air pressure warning signal must activate before the air supply pressure drops below 55 psi in the air tank. If the warning signal does not turn on when being tested during an inspection, the vehicle is not safe to drive.

The warning light should activate.

The vehicle will be unable to shift out of gear.

In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor.

It pumps air into the air storage tanks.

It moves air to the back of the truck.

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.

If used and maintained properly, air brakes are a safe and effective way to stop large, heavy vehicles.

Air brakes are very effective systems.

Other brake systems squeak too loudly.

Air brakes are very effective systems.

Other braking systems are hard to come by.

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.

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 | Missouri 2024 #1 Page 4 of 4

Train for FREE online with our Missouri 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 MO Class A/Class B driver license in 2024, 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 | Missouri 2024 #1 Page 4 of 4

19 . What should happen before the air pressure in an air brake system tank falls below 55 psi?

20 . What does an air compressor do in an air brake system?

21 . The ____ are activated by an electric switch that is triggered by the brake pedal.

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

23 . Manual air tank drains should be:

24 . Why do large vehicles use air brakes?

25 . Air tank drains should:

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