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.
See the exact questions that will be on the 2025 Ohio DMV exam.
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2025 Ohio | Frequently Asked Questions
A CDL Class A license in Ohio is a commercial driver's license that permits the holder to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, provided the GVWR of the vehicle(s) being towed exceeds 10,000 pounds. It typically includes vehicles like tractor-trailers, truck and trailer combinations.
A Class A Commercial Driver's License (CDL) in Ohio allows you to operate any combination of vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 pounds or more, provided the Gross Vehicle Weight Rating (GVWR) of the vehicle(s) being towed is over 10,000 pounds. This typically includes tractor-trailers, truck and trailer combinations, and tank vehicles.
To obtain a Class A 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 successfully complete a written knowledge test. You'll also need to pass a skills test, which includes pre-trip vehicle inspection, basic vehicle control, and on-road driving.
In Ohio, you must be at least 18 years old to qualify for a Class A 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.
While specific endorsements aren't required for a Class A CDL license in Ohio, they can expand your driving opportunities. Endorsements include T (Double/Triple Trailers), P (Passenger), N (Tank Vehicles), H (Hazardous Materials), and X (Combination of Tank Vehicle and Hazardous Materials). Each endorsement requires passing additional knowledge and/or skills tests.
The Class A CDL skills test in Ohio encompasses three main areas: pre-trip vehicle inspection, basic vehicle control, and on-road driving. The pre-trip inspection tests your ability to assess the safety of your vehicle. Basic vehicle control evaluates your ability to maneuver and control the vehicle. The on-road driving test assesses your ability to safely operate the vehicle in various traffic situations.
Yes, Class A CDL license holders in Ohio may face certain restrictions based on their skills and the type of vehicle they're licensed to operate. For instance, drivers may be restricted to operating automatic transmission vehicles only, or prohibited from driving tractor-trailers with fifth wheel connections, among others. These limitations are usually specified on the license.
Yes, in Ohio, the written Class A CDL test is available in multiple languages besides English. However, federal regulations require all CDL applicants to understand and read English to ensure they can comprehend traffic signs and communicate with the public and law enforcement. Therefore, a basic understanding of English is still necessary.
Yes, you can request accommodations for the Class A CDL written test in Ohio if you have a disability. The Bureau of Motor Vehicles (BMV) in Ohio is committed to ensuring that its services are accessible to all individuals. It's recommended to contact your local BMV office in advance to discuss your specific needs and possible accommodations.
Yes, if you don't pass the Class A CDL written test in Ohio, you can retake it. However, you'll have to wait at least 24 hours before attempting the test again. Note that there may be additional fees for each retake. It's recommended to study thoroughly to increase your chances of passing on the next attempt.
