Air Brakes #2
Air Brakes Endorsement Test | Texas 2026 #2 Page 2 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 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 the requirements for CDL may vary from state to state.
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7 . How many air storage tanks are used in an air brake system?
The number varies.
Air storage tanks are used to hold compressed air. The number and size of air tanks in an air brake system varies among vehicles.
8 . During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.
One tenth
Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.
9 . What does ABS do?
Prevent the brakes from being used if downshifting would be more effective
The purpose of an Anti-Lock Braking System (ABS) is to prevent wheels from locking up during hard applications of the brakes, especially on slippery surfaces.
10 . During a static leakage test, the maximum leakage rate for a double combination vehicle is:
4 psi in one minute.
When performing a static leakage test on a double combination vehicle with air brakes, the leakage rate should be no more than 3 psi in one minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.
11 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Keep the control at the halfway mark.
Some pre-1975 vehicles have a front brake limiting valve, which has "normal" and "slippery" settings. The idea behind these valves was to limit the air pressure available to the front brakes when driving on slippery surfaces, and thereby reduce the danger of a front-wheel skid. Studies have found that this is not actually a concern, so if your vehicle has a front brake limiting valve, leave it in the "normal" position.
12 . When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
Alcohol evaporator.
When pressing the brake pedal in a vehicle with S-cam brakes, air will enter the brake chambers. The added air pressure will push out the rods and move slack adjusters, twisting the brake camshafts.
2026 Texas | Frequently Asked Questions
To acquire a CDL Passenger endorsement in Texas, you must first have a valid Texas CDL. Then, you need to pass the passenger transport test. This involves studying the Texas CDL handbook, especially the sections on passenger transport. After studying, schedule and pass the written knowledge test at a Texas DPS office.
To obtain a CDL Passenger license in Texas, you must meet the following criteria: be at least 21 years old, possess a valid Texas driver’s license, pass a Department of Transportation physical exam, successfully complete a commercial driver's license general knowledge test, and pass a passenger transport test. Also, you must demonstrate your ability to safely operate the type of vehicle you plan to drive.
While specific training isn't legally required to secure a CDL Passenger endorsement in Texas, it is highly recommended. Experience driving large vehicles can be beneficial. You must pass a written knowledge test, and training can help prepare for this. Some opt for professional training programs to gain comprehensive knowledge and practical skills before taking the test.
Yes, to get a CDL Passenger endorsement in Texas, you must pass a written knowledge test specifically for passenger transport. This test covers topics like vehicle inspection, loading and trip start, on the road, after-trip vehicle inspection, prohibited practices, and use of brake-door interlocks. Preparation involves studying the relevant sections of the Texas CDL handbook.
During the CDL Passenger endorsement skills test in Texas, you'll need to demonstrate your ability to inspect the vehicle, load and unload passengers safely, use emergency exits, and respond to emergencies. You'll also need to showcase your driving skills including turning, backing up, parking, and navigating through traffic or around obstacles while maintaining passenger safety.
No, you cannot legally transport passengers in Texas without a valid Commercial Driver's License (CDL) with a Passenger (P) endorsement. This endorsement is required for drivers who wish to drive a vehicle that can carry 16 or more passengers, including the driver. Driving without the necessary endorsement could result in heavy fines and penalties.
Yes, you can add a CDL Passenger endorsement to your existing CDL in Texas. You don't need a new license, but you must pass the passenger transport written test. After passing the test, the endorsement will be added to your existing CDL. This allows you to legally drive vehicles designed to carry 16 or more passengers.
Yes, there are restrictions for drivers with a CDL Passenger endorsement in Texas. One key restriction is the "P" restriction, which prohibits drivers from operating a passenger vehicle that is not equipped with air brakes if their driving test was taken in a vehicle without them. Additionally, drivers must follow all federal and state regulations for commercial drivers.
Yes, there are age-related prerequisites and limitations for acquiring the CDL Passenger endorsement in Texas. You must be at least 18 years old to obtain a CDL with a Passenger endorsement, but you can only operate within the state. To operate across state lines or transport hazardous materials, you must be at least 21 years old.
With a CDL Passenger endorsement in Texas, you can operate vehicles designed to transport 16 or more passengers, including the driver. This includes city buses, school buses (with a School Bus endorsement), shuttle buses, charter buses, and some types of vans. However, specific vehicle types may require additional endorsements.