Air Brakes #1
Air Brakes Endorsement Test | Missouri 2025 #1 Page 2 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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7 . 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.
8 . The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
When pressing the brake pedal in a vehicle with S-cam brakes, air will enter the brake chambers. The added air pressure will push out the rods and move slack adjusters, twisting the brake camshafts.
9 . Air pressure should build up in a single air system within:
In single air systems, air pressure should build from approximately 50 to 90 psi within three minutes.
10 . If the low air pressure warning signal comes on, you should:
If the low air pressure warning signal comes on while you are driving a vehicle with air brakes, you should immediately bring the vehicle to a safe stop while you are still able to control the brakes. Inspect and repair the brakes as soon as possible.
11 . What color light indicates a vehicle's ABS is not working?
On vehicles with Anti-Lock Braking Systems (ABS), yellow malfunction lamps alert the driver to ABS malfunction.
12 . Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.
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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.
