Air Brakes #1
Air Brakes Endorsement Test | Oklahoma 2025 #1 Page 3 of 4
Train for FREE online with our Oklahoma 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 OK 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 . Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:
If water and compressor oil are left to build up in an air brake system, the system can be damaged. Air storage tanks are equipped with drains to allow this accumulation to be removed. Manually controlled drains should be operated at the end of each day of driving.
14 . 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.
15 . Truck tractors with air brakes built on or after March 1, 1997 must have:
Truck tractors with air brakes built on or after March 1, 1997, and other vehicles with air brakes built on or after March 1, 1998, must be equipped with anti-lock brakes.
16 . Anti-Lock Braking Systems (ABS):
If equipped, ABS is in addition to a vehicle's normal braking system and does not increase or decrease the braking power of any other system. ABS only activates when a vehicle's wheels are about to lock.
17 . In a dual air brake system:
There are two air brake systems in a dual air brake system. The systems share a set of brake controls, but each system has its own tanks, hoses, and lines.
18 . A slack adjuster should move no more than ____ from where it is attached to the push rod.
Before a trip, you should check each slack adjuster after parking, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure that 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.
See the exact questions that will be on the 2025 Oklahoma DMV exam.
99.2% of people who use the cheat sheet pass the FIRST TIME
Lillian MCcranie explains how our CDL study guide was helpful in passing the exam and recommends it to everyone.
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2025 Oklahoma | Frequently Asked Questions
To acquire a CDL Hazmat endorsement in Oklahoma, you must first have a valid Oklahoma CDL. Then, pass the Hazmat knowledge test at a Department of Public Safety testing facility. After passing the test, submit a fingerprint-based background check and complete TSA security threat assessment. Once approved, your endorsement will be added to your CDL.
To obtain a CDL Hazmat license, you must have a valid Commercial Driver's License (CDL). You must be at least 21 years old and a U.S. citizen or have legal status in the U.S. You need to pass the Hazmat knowledge test and complete a Transportation Security Administration (TSA) background check, including fingerprinting.
When applying for a CDL Hazmat endorsement, you'll need to provide proof of U.S. citizenship or legal status (like a passport or birth certificate), your current Commercial Driver's License (CDL), and proof of Oklahoma residency. You'll also need to bring your TSA background check results and the proof that you've passed the Hazmat Knowledge Test.
Yes, there is a dedicated written test for the CDL Hazmat endorsement. It's called the Hazmat Knowledge Test and is required by the Federal Motor Carrier Safety Administration. This test covers topics like loading and unloading hazardous materials, bulk packaging marking, driving and parking rules, and emergency response procedures.
The written test for the CDL Hazmat endorsement covers topics such as identifying hazardous materials, understanding shipping papers, using placards and labels, loading and unloading hazardous materials, driving and parking rules, emergency procedures, and understanding the risks of different types of hazardous materials.
Yes, acquiring a CDL Hazmat endorsement involves extra charges. In addition to the standard CDL license fee, there is a separate fee for the Hazmat endorsement. This covers the cost of the knowledge test and background check. The exact amount can vary, so it's advisable to check with the Oklahoma Department of Public Safety for current fees.
Yes, obtaining a CDL Hazmat endorsement requires a federal background check and security clearance. This includes fingerprinting and checks for criminal history. The Transportation Security Administration (TSA) conducts this process to ensure that hazardous materials are transported safely and securely across the nation's highways.
Yes, specialized training is required for the CDL Hazmat endorsement. Applicants must pass a written test covering hazardous materials regulations and safety procedures. Also, they must undergo a federal background check and fingerprinting. The endorsement will only be added to your CDL after successful completion of these requirements.
No, you cannot transport hazardous materials without a valid CDL Hazmat endorsement. This endorsement is required by federal law for drivers who operate vehicles carrying hazardous materials. Driving without this endorsement can lead to serious penalties, including fines and suspension of your commercial driver's license.
Yes, you can add the CDL Hazmat endorsement to your current CDL license. You don't need to apply for a new CDL. However, you must pass a written knowledge test on hazardous materials regulations and safety protocols, and complete a TSA background check before the endorsement is added to your license.
