Air Brakes #1
Air Brakes Endorsement Test | Ohio 2025 #1 Page 4 of 4
Train for FREE online with our Ohio 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 OH 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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19 . Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure levels drop to an unsafe level, the parking brake valve should pop out and spring brakes should come on.
20 . A low air pressure warning signal should activate:
When tank pressure falls below 5 psi.
In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.
21 . You should test the low pressure warning signal by:
It is essential that your low pressure warning light functions properly. After allowing the system to charge, you can test the warning signal by rapidly applying and releasing the brake pedal. This will release air from the braking system and the warning signal should come on when pressure drops to a dangerous level.
22 . What do air brakes use to make the brakes work?
Many large CMVs are equipped with air brakes. An air braking system uses compressed air to operate.
23 . In a vehicle with dual parking control valves, a separate air tank can be used:
In a vehicle with dual parking control valves, there is a separate air tank that can be used to temporarily release the spring brakes if they have been activated due to low air pressure. Pushing in the proper control will release the spring brakes for a short period of time, allowing the driver to move the vehicle in an emergency.
24 . What does an air compressor do in an air brake system?
In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor.
25 . When leaving your vehicle unattended:
In general, you should always use the parking brake when parking your vehicle. However, you should not apply the parking brake if your brakes are very hot or if your brakes are wet and temperatures are below freezing.
2025 Ohio | Frequently Asked Questions
In Ohio, a Commercial Driver's License (CDL) Class B allows you to operate a single vehicle with a gross vehicle weight rating (GVWR) of 26,001 lbs or more, or tow a vehicle not exceeding 10,000 lbs. It also permits driving buses, farm labor vehicles, and any vehicle not defined in Class A or Class C.
A Class B CDL license in Ohio allows operation of single vehicles with a gross vehicle weight rating of 26,001 lbs or more, or those towing vehicles not exceeding 10,000 lbs. This includes buses, dump trucks, tow trucks, delivery trucks, garbage trucks, and straight trucks. It does not include Class A or Class C vehicles.
To acquire a Class B CDL license in Ohio, you must be at least 18 years old (21 for interstate driving), possess a valid Ohio driver's license, pass a vision test, and complete a written knowledge exam. Additionally, you must pass a skills test which includes a pre-trip inspection, basic controls test, and on-road driving test. Medical examinations may also be required.
In Ohio, you must be at least 18 years old to qualify for a Class B Commercial Driver's License (CDL) for intrastate driving (within Ohio only). However, if you plan to drive interstate (across state lines) or haul hazardous materials, you must be at least 21 years old.
Specific endorsements aren't necessary for a Class B CDL license in Ohio, but they can expand your driving capabilities. Endorsements are available for passenger transport (P), school buses (S), tank vehicles (N), and hazardous materials (H). Each endorsement requires passing additional knowledge and skills tests.
The Class B CDL skills assessment in Ohio includes three parts: a pre-trip vehicle inspection to test your ability to assess if the vehicle is safe to drive, a basic controls test to evaluate your ability to control the vehicle, and an on-road driving test to assess your skills in traffic situations, including left and right turns, intersections, railway crossings and more.
Yes, there are limitations for Class B CDL license holders in Ohio. They are allowed to operate single vehicles with a gross vehicle weight rating of 26,001 lbs or more, or any such vehicle towing another not exceeding 10,000 lbs. However, they cannot legally operate a Class A combination vehicle. For some vehicles like school buses or tank trucks, special endorsements are required.
In Ohio, the written Class B CDL test is primarily offered in English. However, some locations may offer the test in other languages. It's recommended to contact your local Ohio Bureau of Motor Vehicles (BMV) for specific information on language availability. Note that federal regulations require all CDL holders to read and speak English sufficiently to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, you can request accommodations for the Class B CDL written exam if you have a disability. The Ohio Bureau of Motor Vehicles (BMV) provides reasonable testing accommodations in compliance with the Americans with Disabilities Act (ADA). However, you need to make this request in advance and provide documentation of your disability. Contact your local BMV for specific procedures on requesting accommodations.
Yes, if you fail the Class B CDL written test in Ohio, you can retake it. However, you must wait at least 24 hours before retesting. There is no limit to the number of times you can retake the test, but a retesting fee applies each time. It's advisable to study thoroughly to increase your chances of passing on the next attempt.