The purpose of an Anti-Lock Braking System (ABS) is to prevent wheel lockup while brakes are being applied.

An Anti-Lock Braking System (ABS)

There are two air brake systems in a dual air brake system. The systems share a set of brake controls, but each system has its own tanks, hoses, and lines.

Each system has its own air tanks.

Air tanks are shared between both systems.

Each system has its own air tanks.

You must designate which system you are using.

Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.

The time required for the brakes to work after the brake pedal is pressed

The distance between the brake pedal and the floor

The amount of air pressure used to stop the vehicle

The safety relief valve in an air brake system releases air if necessary to prevent pressure in the system from becoming too high. If the valve starts releasing air, there is something wrong. Have a mechanic fix the problem.

There is something wrong with the brakes.

You should not be concerned as this is a normal process.

There is something wrong with the brakes.

Air Brakes Endorsement Test | Washington 2025 #1

Train for FREE online with our Washington 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 WA 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 | Washington 2025 #1

1 . What helps prevent wheel lockup when braking?

2 . Lights that indicate that anti-lock brakes are not working are:

3 . In a vehicle with dual air brakes, a leak in one system ____ the second system.

4 . In a dual air brake system:

5 . What is brake lag?

6 . If the safety relief valve in an air brake system is releasing air:

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