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.

Some air brake systems have alcohol evaporators, which introduce alcohol into the braking system to help prevent the formation of ice.

Used to introduce alcohol into air brake systems.

Only allowed in the northern parts of the state.

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.

In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.

When tank pressure falls below 60 psi.

When tank pressure falls below 120 psi.

When tank pressure falls below 60 psi.

When tank pressure falls below 10 psi.

When tank pressure falls below 5 psi.

Truck tractors with air brakes built on or after March 1, 1997, and other vehicles with air brakes built on or after March 1, 1998, must be equipped with anti-lock brakes.

An Anti-Lock Braking System (ABS).

Air Brakes Endorsement Test | Virginia 2025 #1 Page 2 of 4

Train for FREE online with our Virginia 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 VA 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 | Virginia 2025 #1 Page 2 of 4

7 . Air tank drains should:

8 . Alcohol evaporators are:

9 . Why do large vehicles use air brakes?

10 . A low air pressure warning signal should activate:

11 . To make a stop in a vehicle equipped with air brakes, the driver should:

12 . Truck tractors with air brakes built on or after March 1, 1997 must have:

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