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.

Study tip:

Reduce your study time from hours to minutes with a DMV exam “Cheat Sheet”

99.2% of people who use the cheat sheet pass the FIRST TIME

Click Here
Full Cheat Sheet

99.2%

99.2% of people who use the cheat sheet pass the FIRST TIME

2025 Mississippi | Frequently Asked Questions

To acquire a CDL Passenger endorsement in Mississippi, you must first have a valid Mississippi CDL. Next, pass the Passenger Transport Test. If you plan to drive a vehicle designed to carry 16 or more passengers, including the driver, you must also pass the Skills Test in a vehicle representative of that class. Please check with Mississippi Department of Public Safety for any additional requirements.

To obtain a CDL Passenger license in Mississippi, you must first hold a valid Commercial Driver's License (CDL). You must then pass the Passenger endorsement knowledge test, which covers topics such as vehicle inspection, passenger loading/unloading, and emergency procedures. Additionally, you must be at least 21 years old and have a clean driving record.

While Mississippi doesn't mandate specific training to secure a CDL Passenger endorsement, it's beneficial. Training can help you pass the written and skills tests. Experience driving similar vehicles is also useful. However, the key requirement is passing the Passenger Transport Test and, for vehicles designed for 16+ passengers, the Skills Test. Always check with the Mississippi Department of Public Safety for updates.

Yes, to get a CDL Passenger endorsement in Mississippi, you are required to pass the Passenger Transport Test. This is a written test that covers specific rules and regulations related to transporting passengers. If you plan on driving a vehicle designed for 16 or more passengers, you'll also need to pass a Skills Test in an appropriate vehicle.

During the CDL Passenger endorsement skills test in Mississippi, you'll need to demonstrate your ability to safely load and unload passengers, respond to emergency situations, conduct pre-trip vehicle inspections, operate the vehicle safely, and execute proper use of mirrors and safe lane changes. You'll also need to show a good understanding of brake usage and vehicle speed control.

No, in Mississippi and throughout the U.S., you cannot legally transport passengers in a commercial vehicle without a valid CDL Passenger endorsement. This endorsement is required for drivers of vehicles designed to carry 16 or more passengers, including the driver. Driving without it can result in serious penalties.

Yes, you can add a CDL Passenger endorsement to your existing commercial driver's license in Mississippi. You don't need a new application for the whole license, but you will have to apply for the endorsement specifically, pass the required tests, and pay an additional fee. The endorsement will then be added to your existing CDL.

Yes, drivers with a CDL Passenger endorsement in Mississippi must adhere to specific regulations. They cannot operate a vehicle that is under recall, they must ensure all passengers are wearing seat belts, and they cannot use handheld devices while driving. Additionally, they must comply with hours-of-service regulations to prevent fatigue-related accidents. Any violation of these rules may result in penalties or loss of endorsement.

Yes, there are age-related prerequisites for acquiring the CDL Passenger endorsement in Mississippi. You must be at least 21 years old to drive a commercial vehicle across state lines (interstate commerce) or to transport hazardous materials. However, if you're only driving within Mississippi (intrastate commerce), you may be able to get a CDL at 18 years old.

With a CDL Passenger endorsement in Mississippi, you're eligible to operate a variety of commercial passenger vehicles. These include buses, shuttle vans, and other vehicles designed to transport 16 or more passengers, including the driver. This endorsement also allows you to drive school buses, provided you also have a School Bus (S) endorsement.