In an air brake system, the application pressure gauge shows how much air pressure is being applied to the brakes. Not all vehicles with an air brake system have this gauge.

Shows how much air pressure is being applied to the brakes.

Shows the temperature of air being used in the braking system.

Shows the pressure of the air coming from the compressor.

Shows the number of times the brakes have been used.

In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.

The vehicle will not shift out of gear.

An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level around 125 psi. This air pressure level is referred to as the "cut-out" level.

Stop the compressor from pumping air.

Begin pumping air into the tanks.

Using the brakes excessively will cause them to overheat, making them less effective. This is referred to as "fading."

Brakes are not used often enough.

Anti-Lock Braking Systems (ABS) are compatible with air braking systems. ABS helps maintain control of a vehicle and prevents the wheels from locking up during hard braking on slippery surfaces. ABS can still provide benefits even if is present on only one axle.

Can assist in maintaining control when braking.

Cannot be used with air brakes.

Should be used on dry pavement.

Can assist in maintaining control when braking.

Should only be used if all axles have ABS.

In a dual air brake system, if one of the air systems gets very low on pressure, either the front or rear brakes will not be operating fully. You should bring your vehicle to a safe stop and have the air system repaired.

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

None of the brakes will work at all.

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

There will be no noticeable affect.

Lights on the outside of the tractor will flash.

Air Brakes Endorsement Test | Oregon 2025 #1

Train for FREE online with our Oregon 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 OR 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 | Oregon 2025 #1

1 . The application pressure gauge:

2 . What happens if the air pressure in a system's air tanks falls below 60 psi?

3 . Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

4 . Brake fading is caused when:

5 . An Anti-Lock Braking System (ABS):

6 . If one air system in a dual air brake system is very low on pressure:

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