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

1 . The application pressure 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, 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.

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

A warning light will come on.

The vehicle will not shift out of gear.

The front lights will flash.

The vehicle should stop.

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.

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

Stop the compressor from pumping air.

Release air from the tanks.

Begin pumping air into the tanks.

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.

4 . Brake fading is caused when:

Brakes are not used often enough.

Brakes overheat.

Brakes are too cold.

Brakes are wet.

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

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

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.

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.

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

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.

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.

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2025 Oregon | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Oregon, you must first hold a valid Oregon CDL. Next, study the Oregon CDL manual's sections on doubles/triples. After preparation, schedule and pass the written knowledge test at your local DMV. Once passed, the endorsement will be added to your CDL. Remember, specific training may be required by your employer.

To obtain a CDL Doubles/Triples license, you must first have a valid Commercial Driver's License (CDL). Then, study the relevant sections of your state's CDL manual, focusing on handling and safety rules for double/triple trailers. After studying, schedule and pass the written knowledge test at your local DMV. Upon passing, the endorsement is added to your CDL.

While Oregon doesn't require specific training to obtain a CDL Doubles/Triples endorsement, you must have a valid CDL. It's crucial to study the CDL manual's sections on double/triple trailers. Passing the written knowledge test at your local DMV secures the endorsement. However, employers may require further specialized training for handling double/triple trailers safely.

Yes, to obtain a CDL Doubles/Triples endorsement in Oregon, you must pass an additional written knowledge test. This exam focuses on specific regulations and safety considerations for driving double and triple trailers. Studying the relevant sections of your state's CDL manual will help you prepare for this test.

For the CDL Doubles/Triples endorsement in Oregon, no specific skills or maneuvers need to be demonstrated as there is no practical skills test. The endorsement requires only a written knowledge test. This exam covers topics like coupling and uncoupling, inspecting doubles and triples, and managing the vehicles' stability.

No, it's not permissible. In Oregon, like in many other states, you must have a valid CDL with a Doubles/Triples endorsement to legally operate double or triple trailers. Driving such vehicles without the proper endorsement can result in significant fines, license suspension, and even legal penalties.

You can add the CDL Doubles/Triples endorsement to your existing commercial driver's license. This process does not require a new application for a CDL. However, you will need to pass the Doubles/Triples written knowledge test and pay the necessary endorsement fee to have this added to your license.

Drivers with a CDL Doubles/Triples endorsement must adhere to specific regulations. These include weight restrictions, proper coupling and uncoupling of trailers, and managing vehicle stability. Also, the endorsement does not allow the operation of tank vehicles or those carrying hazardous materials unless additional endorsements are obtained. Violation of these restrictions can result in fines or loss of the endorsement.

In Oregon, the maximum weight for double/triple trailers is 105,500 pounds, and the maximum length is 61 feet for twins and 75 feet for triples. These measurements include the load and any vehicle or object transported. However, note that these limits can vary depending on the type of road (Interstate vs non-Interstate) and specific local regulations.

Yes, drivers with a CDL Doubles/Triples endorsement must adhere to specific safety guidelines. These include regular vehicle inspections, proper coupling and uncoupling of trailers, and maintaining safe following distances. Additionally, drivers must comply with all federal and state laws regarding hours of service, use of safety equipment, and cargo securement. Violations can result in fines or loss of endorsement.