Air Brakes #2
Air Brakes Endorsement Test | Oregon 2025 #2 Page 2 of 4
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.
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7 . If one air system in a dual air brake system is very low on pressure:
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.
8 . What can happen if the air pressure gets too low in an air brake system?
The brakes will be very sensitive.
Pressing and releasing the brake pedal unnecessarily can let air out faster than the compressor can replace it, reducing the available air pressure. If the air pressure in an air brake system gets too low, the brakes will no longer work.
9 . To inspect slack adjusters on S-cam brakes, you need to:
Chock the wheels and disengage the parking brake.
Check each slack adjuster after parking on level ground, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.
10 . What happens if the air pressure in a system's air tanks falls below 60 psi?
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.
11 . The emergency brake system uses:
Only parts unique to the emergency brake system.
In an air brake system, there are three different braking systems: a service brake system, a parking brake system, and an emergency brake system. The emergency brake system uses parts of both the parking and service brake systems.
12 . Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:
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.
2025 Oregon | Frequently Asked Questions
To secure a CDL Bus endorsement in Oregon, you must first have a Commercial Driver's License (CDL). Then, pass the Passenger Vehicles endorsement written test. After passing the test, you must also pass a skills test in a vehicle representative of the type of bus you'll be driving. Lastly, complete a background check if transporting children.
To obtain a CDL Bus license, you need to have a valid driver's license, pass a physical examination and have good vision and hearing. You must also pass the CDL general knowledge test, the passenger transport test, and a skills test in the type of bus you'll be driving. Lastly, complete a background check if you'll be transporting children.
Yes, specific training is necessary for a CDL Bus endorsement. Applicants must pass the General Knowledge test and the Passenger Transport test. If driving a school bus, they must also pass the School Bus endorsement test. In addition, they must complete a commercial driver training course and gain experience through supervised driving.
CDL Bus licenses fall into three main classifications: Class A, B, and C. Class A is for vehicles towing trailers over 10,000 lbs, which doesn't typically apply to buses. Class B is for single vehicles over 26,001 lbs or towing trailers under 10,000 lbs, like city buses. Class C is for vehicles designed to transport 16 or more passengers (including the driver), like school buses.
No, you cannot use your personal vehicle for the CDL Bus driving test. The vehicle used must match the type and class of CDL you are applying for. Therefore, if you're applying for a bus endorsement, you are required to take the test in the type of bus that you will be driving.
During the CDL Bus driving test in Oregon, you'll be evaluated on specific skills such as pre-trip vehicle inspection, backing exercises (straight line, offset, and parallel parking), and on-road driving. On-road driving includes checking your ability to manage intersections, turns, lane changes, stop/start in traffic, and railway crossings, among other maneuvers.
Yes, additional medical prerequisites are required for a CDL Bus endorsement. You must pass a Department of Transportation (DOT) physical examination every two years. This exam assesses your general health, hearing and vision capabilities, blood pressure, and checks for conditions like diabetes or heart disease that could affect your ability to safely operate a commercial vehicle.
No, it is illegal to transport passengers without a valid CDL Bus endorsement in Oregon. This endorsement is required by law to ensure that the driver has the necessary skills and knowledge to safely operate a passenger vehicle. Violating this can result in hefty fines, loss of your driving privileges, or even imprisonment.
Yes, the CDL Bus endorsement can be added to your existing CDL. You don't need a new license, but you will need to pass the Passenger Endorsement Knowledge Test and a skills test in the vehicle group you wish to be licensed for. This ensures you have the necessary skills and knowledge to safely operate a bus or passenger vehicle.
Yes, drivers with a CDL Bus endorsement in Oregon must comply with various restrictions and regulations. These include maintaining a clean driving record, passing regular physical exams, and adhering to hours-of-service regulations. Additionally, they must not have any disqualifying criminal offenses, and are subject to random drug and alcohol testing.