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.
2025 Missouri | Frequently Asked Questions
To acquire a CDL Tank endorsement in Missouri, you need to pass the knowledge test specific to tank vehicles. You can prepare for the test using the Missouri CDL manual. Visit a local Missouri Driver License Office to take the test. Passing this test allows you to legally operate commercial vehicles designed to transport liquid or gaseous materials.
To obtain a CDL Tank license in Missouri, you must have a basic CDL license first. Then, you'll need to pass the Tank Vehicle endorsement test. This test covers the knowledge of tank vehicles, inspecting tank vehicles, driving tank vehicles, and safe driving rules. You may also need additional endorsements depending on the vehicle's specific requirements.
While Missouri doesn't explicitly require specific training or experience to get a CDL Tank endorsement, it's beneficial to have practical training. This helps in passing the Tank Vehicle endorsement test, which covers topics like inspecting tank vehicles and safe driving rules. Prior experience can also be useful but isn't mandatory.
Yes, in Missouri, to obtain a CDL Tank endorsement, you need to pass an additional written test called the Tank Vehicle endorsement test. This test covers the knowledge of tank vehicles, their inspection, and safe driving rules. Note that this is in addition to the general CDL written exam.
The written test for the CDL Tank endorsement in Missouri includes subjects such as the safe operation of tank vehicles, tank vehicle inspections, proper loading and unloading procedures, and the transportation of hazardous materials. Additionally, you may be tested on topics like emergency response and the use of emergency equipment specific to tank vehicles.
The CDL Tank endorsement written test in Missouri focuses on the knowledge rather than practical skills or maneuvers. It covers subjects like inspecting tank vehicles, recognizing high center of gravity, handling surge, driving tank vehicles, and safe driving rules and practices specific to tank vehicles. There's no separate skills or road test for the Tank endorsement.
In Missouri, drivers with a CDL Tank endorsement must adhere to specific regulations. For instance, they must always ensure the tank is not overloaded and the load is properly balanced. Additionally, they must follow safety protocols while loading and unloading. Violation of these guidelines can lead to endorsement revocation or legal penalties. Note that endorsements don't grant authority to transport hazardous materials unless you also have a Hazmat endorsement.
No, in Missouri, you cannot legally transport liquid or gas materials without a valid CDL Tank endorsement. This endorsement is required for drivers who operate commercial vehicles transporting liquids or gases in a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1,000 gallons or more. Violations can lead to serious penalties.
In Missouri, the CDL Tank endorsement can be added to your existing Commercial Driver's License. You don't need a fresh application for a new license. However, you must pass the Tank Vehicle written test. Once you pass the test, the endorsement will be added to your CDL, enabling you to legally transport liquid or gas materials.
Yes, to handle hazardous materials with a CDL Tank endorsement in Missouri, drivers must also have a Hazardous Materials (H) endorsement. This requires passing a written test on federal and state regulations for transporting hazardous materials. Additionally, drivers must undergo a federal background check and fingerprinting. Failure to comply with these regulations can result in severe penalties.