Air Brakes #2
Air Brakes Endorsement Test | Mississippi 2025 #2 Page 4 of 4
Train for FREE online with our Mississippi 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 MS 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 . Some air brake systems use alcohol:
To reduce the risk of rust forming on air brake valves.
Some air brake systems contain an alcohol evaporator. This device introduces alcohol into the braking system to inhibit the formation of ice.
20 . Brakes can get out of adjustment quickly, especially:
Brakes are particularly prone to getting out of adjustment if they are hot. Be sure to routinely check the adjustment of your brakes. For a vehicle to be safely controlled, all brakes must be properly functioning and adjusted.
21 . What should happen if the air pressure in the air brake system tanks falls below 60 psi?
The vehicle should stop.
On vehicles with air brakes, a low air pressure warning signal will come on if the pressure in the air tanks falls below 60 psi. On large buses, the signal may activate at 80 to 85 psi.
22 . If the low pressure warning light comes on while you are driving:
You should stay at least 100 feet away from other vehicles.
When driving a vehicle with air brakes, if the low air pressure warning light comes on, it is important for you to stop and safely park your vehicle as soon as possible. There may be a leak in the system. Controlled braking will remain possible only as long as there is enough air left in the tanks.
23 . 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.
24 . To use the stab braking method, you should:
Apply the emergency brake until the vehicle starts to slow.
The stab braking method for emergency stops involves fully applying the brakes until they lock up. The brakes are then released until the wheels start rolling, and then the process is repeated.
25 . When traveling down a steep downgrade, the best way to use your brakes is to:
Apply consistent pressure to the brake pedal all the way down the hill.
On a long or steep downgrade, brakes should only be used to supplement the braking effect of the engine. Apply the brakes just enough to feel a definite slowing down, then release them once you are about 5 mph below your target "safe" speed. Once your vehicle reaches its safe speed again, repeat this process.
2025 Mississippi | Frequently Asked Questions
To acquire a CDL Hazmat endorsement in Mississippi, you must already possess a Commercial Driver's License (CDL). Then, pass the Hazardous Materials Knowledge Test at your local DMV. After passing, you'll need to undergo a TSA background check. Once cleared, pay the endorsement fee to have the Hazmat endorsement added to your CDL.
To obtain a CDL Hazmat license, you must first have a Commercial Driver's License (CDL). Then, you need to pass the Hazardous Materials Knowledge Test. You should be at least 21 years old, have no disqualifying criminal offenses, and pass a TSA Security Threat Assessment. It's also recommended to have good driving records and physical health.
When applying for a CDL Hazmat endorsement, you need to provide proof of U.S. citizenship or lawful permanent residency (like a passport or birth certificate), your valid Mississippi driver's license, and your Social Security number. You also need to submit a Medical Examiner's Certificate, proof of residency in Mississippi, and complete the TSA background check.
Yes, there is a dedicated written test for the CDL Hazmat endorsement. This test covers topics like loading and unloading hazardous materials, bulk packaging marking, driving and parking rules, and emergency response procedures. Passing this test is necessary to receive the Hazmat endorsement on your Commercial Driver's License (CDL).
The written test for the CDL Hazmat endorsement covers various subjects, including identification of hazardous materials, loading and unloading procedures, use of placards and labels, emergency response procedures, and federal regulations related to hazardous materials transportation. It also tests knowledge on the handling and transport of specific types of hazardous materials.
Yes, there are extra charges linked to acquiring a CDL Hazmat endorsement. Costs can include the application fee, fingerprinting fee, and background check fee. However, these fees can vary by state and the specific type of endorsement. It's recommended to check with your local DMV or similar agency for the most accurate and up-to-date information.
Yes, background checks and security clearances are mandatory for the CDL Hazmat endorsement. The Transportation Security Administration (TSA) conducts a federal background check, including fingerprinting. The applicant must not have any disqualifying criminal offenses. This process ensures that hazardous materials are transported safely and securely by trustworthy individuals.
Yes, specialized training is mandatory for the CDL Hazmat endorsement. Applicants must pass a written test to demonstrate knowledge of hazardous materials. After passing the test, they receive a certificate of completion. This certification is then used to obtain the Hazmat endorsement on a CDL. The endorsement must be renewed periodically, which may require additional training or testing.
No, you cannot legally transport hazardous materials without a valid CDL Hazmat endorsement in Mississippi. This endorsement is required by federal law and ensures that drivers are properly trained to handle and transport hazardous materials safely. Violating this law can result in severe penalties, including fines and suspension of your CDL.
Yes, you can add the CDL Hazmat endorsement to your current CDL license. You don't need to apply for a new license. However, you will need to pass a written test and undergo a TSA security threat assessment, which includes fingerprinting and a background check. Once you've passed these, the endorsement can be added to your existing CDL.