Air Brakes #1
Air Brakes Endorsement Test | Alabama 2025 #1 Page 4 of 4
Train for FREE online with our Alabama 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 AL 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 . 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.
20 . What is a wig wag?
A part within the braking unit that allows air to move freely
A wig wag is a type of low air pressure warning device in an air brake system. It drops a mechanical arm into the driver's view when the air pressure in the tanks falls below 60 psi.
21 . On flat surfaces, wheel chocks:
In situations where a driver cannot use a parking brake, wheel chocks can be used to hold a parked vehicle in place on a level surface.
22 . Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
Vehicles with ABS have yellow malfunction lamps to alert drivers when the braking systems are not working. Be sure you know where the malfunction lamp on your vehicle is before beginning a trip.
23 . Brakes may get out of adjustment:
If they get wet.
Brakes can get out of adjustment quickly, especially if they are used to the point of overheating. Brake adjustment should be checked frequently.
24 . 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.
25 . In a dual air brake system:
One system is the main braking system and a second system is ready to be used if the first one fails.
A dual air brake system is made up of two separate air brake systems. The systems share a single set of brake controls, but each has its own air tanks, hoses, and lines.
2025 Alabama | Frequently Asked Questions
To acquire a CDL Hazmat endorsement in Alabama, you must have a valid Alabama CDL. Next, pass the Hazardous Materials Endorsement Knowledge Test. Complete a background check and fingerprinting through the Transportation Security Administration (TSA). Finally, submit your application with the required fees to the Alabama Department of Public Safety. Training courses are recommended but not mandatory.
To obtain a CDL Hazmat license, you need to have a valid Commercial Driver's License (CDL). You must also pass the Hazardous Materials Endorsement Knowledge Test. Prior to applying for the endorsement, you must clear a TSA background check. Be aware that certain criminal offenses may disqualify you from obtaining the Hazmat endorsement.
When applying for a CDL Hazmat endorsement, you need to provide a completed application form, proof of U.S. citizenship or lawful permanent residency (like a passport or birth certificate), and your current valid Commercial Driver's License (CDL). A medical examiner's certificate may also be required. Lastly, you must pass the TSA background check and fingerprinting.
Yes, there is a dedicated written test for the CDL Hazmat endorsement. This test covers topics such as loading and unloading hazardous materials, bulk packaging marking, driving and parking rules, and emergency response procedures. Passing this test is mandatory for obtaining the Hazmat endorsement on your Commercial Driver's License (CDL).
The CDL Hazmat endorsement written test covers a range of subjects including: understanding the different types of hazardous materials and their associated risks, proper loading and unloading procedures, correct use of placards and labels, emergency response procedures in case of an incident, and regulations for transport of hazardous materials. It's designed to ensure drivers can safely handle hazardous cargo.
Yes, there are extra charges associated with obtaining a CDL Hazmat endorsement. In Alabama, the endorsement itself costs $20. However, you also need to account for the cost of the TSA background check and fingerprinting, which is approximately $86.50. These prices can vary slightly, so it's best to check the current fees when you apply.
Yes, to receive a CDL Hazmat endorsement, you're required to undergo a federal security threat assessment conducted by the Transportation Security Administration (TSA). This includes a fingerprint-based criminal history records check. The goal is to ensure that you don't pose a security threat and are fit to transport hazardous materials safely.
Yes, specialized training is required for a CDL Hazmat endorsement. This includes passing a written test covering hazardous materials regulations and safe handling procedures. Candidates must also pass a Transportation Security Administration (TSA) background check. While not mandatory, many choose to complete a training course to prepare for the test and handle hazardous materials safely.
No, you cannot transport hazardous materials without a valid CDL Hazmat endorsement in Alabama. The endorsement is required by federal law to ensure that drivers have the necessary knowledge and skills to safely transport hazardous materials. Driving without this endorsement could result in serious penalties, including fines and suspension of your CDL license.
Yes, you can add the CDL Hazmat endorsement to your existing CDL license. You don't need to apply for a new CDL. However, you must pass the Hazmat knowledge test, undergo a TSA background check, and pay the required fees. Once these steps are complete, the endorsement will be added to your current CDL license.