Air Brakes #2
Air Brakes Endorsement Test | Ohio 2025 #2 Page 3 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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13 . Air tank drains:
Compressed air in an air brake system usually has a certain amount of water and oil in it. This can harm the system if allowed to accumulate. Air tanks have drain valves to aid in removing water and oil from the compressed air.
14 . 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.
15 . 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.
16 . Failing to drain air tanks could result in:
In an air brake system, the air tanks must be periodically drained to remove accumulations of water and compressor oil. If water is not removed, it could freeze in cold weather and cause brake failure.
17 . 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.
18 . What kind of brakes do most newer heavy-duty trucks use?
Most newer heavy-duty vehicles use dual air brake systems. A dual air brake system has two separate air brake systems which use a single set of brake controls.
See the exact questions that will be on the 2025 Ohio DMV exam.
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2025 Ohio | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in Ohio, you must first have a Commercial Driver's License (CDL). You then need to pass the Doubles/Triples Knowledge test. After passing the test, you can apply for the endorsement at your local Bureau of Motor Vehicles (BMV). Remember, driving experience with large trucks is highly recommended before applying.
To obtain a CDL Doubles/Triples license, you first need a valid Commercial Driver's License (CDL). Then, study the Doubles/Triples section of your state's CDL manual. After studying, you'll need to pass a written knowledge test at a local Bureau of Motor Vehicles (BMV). The test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling.
While Ohio doesn't explicitly require specialized training for a CDL Doubles/Triples endorsement, it's highly recommended. Experience with large trucks is beneficial as handling double/triple trailers is complex. Preparing for the Doubles/Triples Knowledge test, which includes questions on coupling and uncoupling, inspecting doubles and triples, and checking air brakes, will also require some form of study or training.
Yes, to obtain a CDL Doubles/Triples endorsement in Ohio, you are required to pass the Doubles/Triples Knowledge test. This test focuses on specific areas like coupling and uncoupling, inspecting doubles and triples, and checking air brakes. It's crucial to study these areas thoroughly to successfully pass the exam.
The CDL Doubles/Triples endorsement test in Ohio is a written knowledge test, not a skills test. Therefore, you won't need to showcase any physical maneuvers. However, you'll need to demonstrate understanding of topics like coupling and uncoupling, inspecting doubles and triples, checking air brakes, and driving safely with more than one trailer.
No, it is not permissible to operate double/triple trailers without a valid CDL Doubles/Triples endorsement in Ohio. Operating such vehicles without the correct endorsement could result in fines, penalties, and potentially the suspension of your CDL. It's important to obtain the correct endorsements for the type of vehicle you're operating.
You can add the CDL Doubles/Triples endorsement to your existing commercial driver's license. You don't need to start a new application for a separate license. However, you will need to pass the Doubles/Triples Knowledge test and pay any associated fees to have this endorsement added to your current CDL.
Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. Drivers must strictly adhere to weight limits for double/triple trailers. They must also ensure proper coupling and uncoupling procedures, inspect trailers, and manage safe driving conditions. Additionally, certain highways or roads may prohibit the use of double/triple trailers due to their size.
In Ohio, the maximum weight for a vehicle with a double trailer is 80,000 pounds and the maximum length is 75 feet. For triple trailers, the maximum weight is also 80,000 pounds, but the length can vary. However, triples are rarely used due to their size and are restricted on many highways. Always check with local regulations for specific restrictions.
Yes, Ohio has specific safety guidelines for driving double/triple trailers. Drivers must understand how to couple and uncouple correctly, and how to inspect their vehicles. They must also know how to manage the space around their vehicle, control speed, and maneuver in different situations. Following these guidelines helps ensure the safety of everyone on the road.
