Air Brakes #1
Air Brakes Endorsement Test | Texas 2025 #1 Page 4 of 4
Train for FREE online with our Texas 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 TX 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 . Pressing and releasing a brake pedal unnecessarily can:
Create a loud noise.
In an air brake system, pressing and releasing the brake pedal unnecessarily can release air from the braking system faster than the compressor can replace it.
20 . An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:
80 psi.
An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level of 125 psi. This air pressure level is referred to as the "cut-out" level.
21 . Most heavy-duty vehicles use ____ air brake systems.
Quad
The majority of heavy-duty vehicles are equipped with dual air brake systems.
22 . If your tractor is equipped with ABS but your trailer is not, the ABS:
Will allow others to see when you brake.
In a tractor-trailer combination, if the tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the ABS will still improve the driver's steering control. The driver should keep an eye on the trailer and let up on the brakes if the trailer begins to swing out.
23 . What can happen if the air pressure gets too low in an air brake system?
The brakes will be very sensitive.
Pressing and releasing the brake pedal unnecessarily can let air out faster than the compressor can replace it, reducing the available air pressure. If the air pressure in an air brake system gets too low, the brakes will no longer work.
24 . To use the stab braking method in an emergency situation, you should:
Apply the emergency brake.
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, then the process is repeated.
25 . During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:
4 psi in one minute.
It is important to know the maximum air loss rate that is safe for your specific vehicle. A single vehicle with air brakes should have a leakage rate no higher than 3 psi in a minute during an applied leakage test.
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2025 Texas | Frequently Asked Questions
A CDL Class B license in Texas allows the holder to operate single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or any such vehicle towing another not exceeding 10,000 pounds. This includes buses, farm labor vehicles, and any combination of vehicles that are not Class A vehicles.
A Class B CDL license in Texas allows the holder to operate vehicles such as straight trucks, large buses, segmented buses, box trucks, dump trucks with small trailers, and tractor-trailers. However, it is important to note that any trailer being towed must not exceed a gross vehicle weight rating of 10,000 pounds.
To acquire a Class B CDL license in Texas, applicants must be at least 18 years old (21 for interstate driving), possess a valid Texas driver's license, pass a vision exam, and successfully complete a knowledge test. They must also pass a skills test, which includes a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving examination.
In Texas, you must be at least 18 years old to qualify for a Class B Commercial Driver's License (CDL) for intrastate driving (within Texas only). However, if you intend to drive across state lines (interstate driving), federal regulations require you to be at least 21 years old.
While not always necessary, specific endorsements can be added to a Class B CDL license in Texas to allow for the operation of special types of vehicles. These include passenger (P), school bus (S), and tanker (N) endorsements. Each endorsement requires additional knowledge tests, and some also require a skills test.
The Class B CDL skills assessment in Texas includes three parts: a pre-trip vehicle inspection to check your understanding of your vehicle and its operation, a basic controls test to assess your ability to control the vehicle, and a road test to evaluate your on-road driving skills in various traffic situations and environments.
Yes, there are limitations for Class B CDL license holders in Texas. They are permitted to operate single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or tow a vehicle not exceeding 10,000 pounds GVWR. However, they cannot operate Class A vehicles unless they upgrade their license.
In Texas, the written Class B CDL test is primarily offered in English. However, Spanish versions are available. Please note that all CDL applicants must pass an English proficiency test, as federal regulations require all CDL holders to read and speak English sufficiently to communicate with the general public, understand highway traffic signs and signals, and respond to official inquiries.
Yes, the Texas Department of Public Safety (DPS) provides reasonable accommodations for individuals with disabilities during the Class B CDL written exam. You need to request these accommodations in advance. Contact your local DPS office for more information about the process and to discuss your specific needs.
Yes, if you don't pass the Class B CDL written test in Texas, you can retake it. However, you will need to wait at least one day before retesting. Keep in mind that additional fees may apply each time you retake the test. It's recommended to study thoroughly and use available practice tests to increase your chances of passing on the next attempt.
