Air Brakes #2
Air Brakes Endorsement Test | Missouri 2025 #2 Page 4 of 4
Train for FREE online with our Missouri 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 MO 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 . Friction in an S-cam brake is caused when the brake shoes and linings:
Friction inside a brake drum is caused when the brake shoes and linings push against the inside of the drum. The friction in the drums will slow and stop the vehicle.
20 . Manual air tank drains should be:
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Manually operated air tank drains must be opened daily to remove this build-up.
21 . A wig wag is:
Vehicles with air brakes are required to be equipped with a low pressure warning device. A wig wag is a type of low air pressure warning device. This device drops a mechanical arm into the driver's view if the pressure in the tanks drops to a level between 55 and 75 psi.
22 . 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.
23 . What is brake lag?
Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.
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 . Air storage tanks:
In an air brake system, the air storage tanks hold compressed air to be used by the brakes. The number and size of air tanks varies among vehicles.
See the exact questions that will be on the 2025 Missouri DMV exam.
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2025 Missouri | Frequently Asked Questions
To acquire a CDL Hazmat endorsement in Missouri, you must first have a Commercial Driver's License (CDL). After that, apply for the endorsement at a Missouri State Highway Patrol Driver Examination Station, pass the written test, and complete a federal security threat assessment. This includes fingerprinting and background checks conducted by the Transportation Security Administration (TSA).
To obtain a CDL Hazmat license in Missouri, you must already have a Commercial Driver's License (CDL). You also need to pass the Hazardous Materials Endorsement Knowledge Test, provide proof of U.S. citizenship or lawful permanent residency, complete a fingerprint-based background check, and pass the TSA security threat assessment.
When applying for a CDL Hazmat endorsement in Missouri, you need to provide proof of U.S. citizenship or lawful permanent residency. This could be a birth certificate, passport, or green card. Additionally, you'll need your current Commercial Driver's License (CDL), your Social Security card, and completed application forms for the Hazmat endorsement and TSA security threat assessment.
Yes, there is a dedicated written test for the CDL Hazmat endorsement in Missouri. The Hazardous Materials Endorsement Knowledge Test covers topics related to the transport of hazardous materials, including safety procedures, regulations, and handling techniques. You must pass this test to receive your Hazmat endorsement.
The written test for the CDL Hazmat endorsement in Missouri covers several topics related to hazardous materials. These include identifying different types of hazardous materials, understanding shipping papers and placards, loading and unloading procedures, safety rules, emergency response procedures, and federal regulations related to hazardous material transportation.
Yes, obtaining a CDL Hazmat endorsement in Missouri involves additional fees. This includes a $25.50 fee for the endorsement itself and a $86.50 fee for the required TSA background check. These fees are subject to change, so it's advisable to check with the Missouri Department of Revenue for the most current information.
Yes, obtaining a CDL Hazmat endorsement in Missouri requires a federal background check and a security threat assessment by the Transportation Security Administration (TSA). These are mandatory steps to ensure the safety and security of hazardous materials transportation. The applicant must be free of disqualifying criminal offenses to receive the endorsement.
Yes, obtaining a CDL Hazmat endorsement in Missouri necessitates specialized training. You must pass a written test based on the Hazardous Materials section of the Missouri Commercial Driver License Manual. While no specific certification is required, training helps ensure you understand how to safely transport hazardous materials.
No, you cannot transport hazardous materials in Missouri without a valid Commercial Driver's License (CDL) with a Hazardous Materials (Hazmat) endorsement. This is a federal regulation enforced by the U.S. Department of Transportation. Violating this rule can result in substantial fines and penalties, including the suspension or revocation of your CDL.
Yes, you can add a Hazmat endorsement to your current CDL license in Missouri. You don't need to apply for a new CDL. However, you must pass the Hazardous Materials Knowledge Test, provide fingerprints for a background check, and undergo a TSA security threat assessment to get the endorsement.
