Knowledge Test Class B #1
Class B Driving Test | Texas 2026 #1 Page 2 of 7
Train for FREE online with our Texas class B license 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 CDL class B permit in 2026, 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 CDL class B requirements may vary from state to state.
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8 . When a brake pedal is pressed and the S-cam is turned, the S-cam:
Releases air from the air tanks.
When a brake pedal is pressed and the S-cam is turned, the S-cam presses the brake shoes against the inside of the brake drum. This causes friction and will cause the vehicle to slow.
9 . Which of the following is not acceptable emergency equipment?
Four yellow squares
During the vehicle inspection test, you will need to show emergency equipment, including spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and a properly charged and rated fire extinguisher.
10 . What happens if the air pressure in a system's air tanks falls below 60 psi?
The vehicle should stop.
In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.
11 . If the low pressure warning light comes on while you are driving:
You should continue driving, but turn the emergency flashers on to warn other motorists.
If the low air pressure warning light turns on, you should stop and safely park your vehicle as soon as possible. Controlled braking will be possible only as long as enough air remains in the tanks.
12 . A low air pressure warning signal should activate:
When tank pressure falls below 5 psi.
In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 55 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.
13 . In cold weather, an alcohol evaporator should be checked and filled:
Once a month.
An alcohol evaporator can help prevent ice from building up in an air brake system. In cold weather, the evaporator should be checked and refilled every day.
14 . Passive railroad crossings:
Should never be crossed by a CMV.
Railroad crossings that are not controlled by any type of traffic control device are known as passive crossings. The decision to proceed across tracks at a passive crossing is entirely up to the driver.
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2026 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.
