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.
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2025 Mississippi | Frequently Asked Questions
A CDL Class A license in Mississippi allows the holder to operate any combination of vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 pounds or more, provided the Gross Vehicle Weight Rating (GVWR) of the vehicle(s) being towed is over 10,000 pounds. This typically includes tractor-trailer combinations.
A Class A CDL license in Mississippi permits the operation of vehicles such as tractor-trailers, truck and trailer combinations, tank vehicles, livestock carriers, and flatbeds. Basically, it covers any combination of vehicles with a gross combination weight rating (GCWR) of 26,001 pounds or more if the towed vehicle is over 10,000 pounds.
To obtain a Class A CDL in Mississippi, you must be at least 21 years old (18 for intrastate travel), possess a valid Mississippi driver's license, pass a vision test, and complete a written knowledge exam. You'll also need to pass skills tests in a vehicle representative of the class you're applying for, and meet medical requirements.
In Mississippi, you must be at least 21 years old to qualify for a Class A CDL license for interstate driving. However, you can be 18 years old to apply for a CDL for intrastate driving, which limits you to driving within the state of Mississippi only.
Endorsements aren't required for a Class A CDL license, however, they can enhance your license. They allow you to drive specific types of vehicles like tank vehicles, passenger vehicles, school buses or transport hazardous materials. To get an endorsement, you must pass additional written and skills tests related to the specific type of vehicle.
The Class A CDL skills test in Mississippi encompasses three sections: a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving test. These tests evaluate your ability to inspect your vehicle before the trip, control the vehicle during typical maneuvers, and drive safely in various road and traffic conditions.
Yes, there are limitations. Class A CDL license holders in Mississippi may be restricted based on the type of vehicle they tested in. For instance, if the test was taken in an automatic vehicle, they can't drive a manual truck. Other limitations could be related to air brakes, passengers, tank vehicles, and hazardous materials.
In Mississippi, the written Class A CDL test is generally conducted in English. However, some states may offer the test in Spanish. Non-English speakers can usually use a dictionary or bring an interpreter. It's important to check with the local DMV office for specific language accommodations. Remember, federal regulations require all CDL holders to read and speak English.
Yes, you can request accommodations for the Class A CDL written test if you have a disability. Mississippi's Department of Public Safety works to ensure accessibility for all test-takers. Accommodations may include extra time, a separate testing room, or assistive technology. You should contact your local testing center in advance to discuss your needs and arrange accommodations.
Yes, if you don't pass the Class A CDL written test in Mississippi, you can retake it. However, you may have to wait a specified period before you can reattempt it. It's also likely that you'll have to pay a retesting fee. Check with the Mississippi Department of Public Safety for specific rules and regulations regarding retakes.
