When parking on a level surface, you should use wheel chocks. If the vehicle is not equipped with spring brakes, this is essential to prevent the trailer from moving.

Use wheel chocks to prevent your vehicle from moving.

Use wheel chocks, but only if you have applied the parking brake.

On long and/or steep downgrades, you should primarily use engine braking to control the speed of your vehicle. Use your brakes only as a supplement to this effect.

The vehicle should be placed in a low gear and the driver should use engine braking.

The driver should continually downshift instead of using the brakes.

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).

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 #2 Page 2 of 4

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 #2 Page 2 of 4

7 . When parked on a flat surface, you should:

8 . When traveling down a steep downgrade:

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

10 . What is brake lag?

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

12 . 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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