Air Brakes Endorsement Test | Mississippi 2025 #1

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.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . Spring brakes come on:

When too much air pressure is lost.

When a control on the dashboard is activated.

When the tires have minimal tread depth.

When the brakes are noisy.

Spring brakes come on automatically when air pressure drops to an unsafe psi level. Instead of waiting for the spring brakes to automatically activate, you should safely exit the road as soon as you notice the low pressure warning signal and bring your vehicle to a stop while you are still able to control the brakes.

2 . In a dual air brake system, if one air system is very low on pressure:

None of the brakes will work at all.

Either the front or rear brakes will not be fully operable.

There is usually no noticeable effect.

In a dual air brake system, either the front or rear brakes will not be fully operable if one of the air systems gets too low on pressure. If the air pressure in either tank gets too low while you are driving, you should exit the road and park as soon as possible.

3 . What is brake lag?

The time required for the brakes to work after the brake pedal is pushed

The distance between the brake pedal’s resting position and the floor

The amount of air pressure used to stop a vehicle

How faded the brakes are

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. On vehicles with hydraulic brakes, the brakes work instantly when the pedal is pressed.

4 . Some air brake systems use alcohol:

To reduce the risk of ice forming in air brake valves.

To make the compressor run more efficiently.

To lubricate parts of the braking system.

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.

5 . What do anti-lock brakes do?

Help a driver avoid wheel lockup

Lock up the front wheels

Prevent a vehicle from accelerating while traveling uphill

Prevent a vehicle from accelerating while traveling downhill

The function of an Anti-Lock Braking System (ABS) is to prevent the vehicle's wheels from locking up from hard brake application.

6 . If using air tanks with manually operated drains, how often should you drain the tanks?

Every day

Once a week

Once a month

Once every six months

In an air brake system with manually operated drains, the tanks should be drained at the end of each day of driving.

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2025 Mississippi | Frequently Asked Questions

To secure a CDL Bus endorsement in Mississippi, you must first have a Commercial Driver's License (CDL). Then, pass the Passenger Vehicles test to get the Passenger (P) endorsement. This includes written and skills tests on inspecting passenger vehicles, loading/unloading passengers, and emergency procedures. Check with the Mississippi Department of Public Safety for specific requirements and procedures.

To obtain a CDL Bus license, you must have a valid driver's license, pass a physical examination, and complete a training course. Afterward, you'll need to pass the Commercial Driver's License (CDL) general knowledge test and the passenger endorsement test. Finally, you must pass a skills test in the type of bus you wish to drive.

In Mississippi, specific training is not mandated by the state for a CDL Bus endorsement, but it's highly recommended. Training can help you pass the required written and skills tests. Some employers may also require it. Experience driving similar vehicles can be beneficial but is not explicitly required by the state. Always check with the Mississippi Department of Public Safety for any updates.

CDL Bus licenses fall under Class A, B, or C. Class A doesn't typically apply to bus drivers. Class B is for commercial vehicles like city buses. Class C is for vehicles designed to carry 16 or more passengers (including the driver) not covered by B class. The specific class required depends on the vehicle's size and capacity.

In Mississippi, you cannot use your personal vehicle for a CDL Bus driving test. The vehicle you use must match the class of CDL you are trying to obtain. For example, if you're applying for a passenger bus endorsement, you will need to take the test in a vehicle that meets the specific requirements for that endorsement as outlined by the Mississippi Department of Public Safety.

During the CDL Bus driving test in Mississippi, you will be evaluated on skills such as vehicle inspection, basic control skills like backing and parking, and on-road driving. This includes handling intersections, traffic signals, stopping at railroad crossings, and highway driving. You will also be assessed on your ability to handle emergency situations and maintain passenger safety.

Yes, additional medical prerequisites are required for a CDL Bus endorsement in Mississippi. You must pass a Federal Motor Carrier Safety Administration (FMCSA) physical examination every 24 months. The exam assesses physical and mental health to ensure you can safely operate a commercial vehicle. This includes checks on vision, hearing, blood pressure, and absence of any medical conditions that could impede safe driving.

No, it's not permissible to transport passengers without a valid CDL Bus endorsement in Mississippi. The endorsement is a legal requirement indicating that the driver has passed the necessary tests and demonstrated the skills needed to safely operate a passenger vehicle. Driving without this endorsement can result in fines, license suspension, or other legal consequences.

In Mississippi, you can add a CDL Bus endorsement to your existing license. You don't need a new application. However, you are required to pass the passenger vehicle knowledge test and the skills test in a passenger vehicle of the same class your current CDL permits you to drive. Also, a valid Department of Transportation medical card is necessary.

Yes, there are restrictions for drivers with a CDL Bus endorsement in Mississippi. Drivers must maintain a clean driving record and pass regular physical exams. They must also comply with federal regulations regarding hours of service, which limit the number of hours they can drive without rest. Failure to adhere to these rules can result in the suspension or loss of the endorsement.