Air Brakes #2
Air Brakes Endorsement Test | Utah 2025 #2 Page 2 of 4
Train for FREE online with our Utah 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 UT 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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7 . Some air brake systems use alcohol:
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.
8 . 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.
9 . If using air tanks with manually operated drains, how often should you drain the tanks?
Once every 3,000 miles
To prevent the build up of oil and water in a vehicle's air tanks, manually operated air tank drains should be used at the end of each day of driving.
10 . Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:
Anti-Lock Braking Systems (ABS).
Truck tractors with air brakes that were manufactured on or after March 1, 1997 are required to be equipped with Anti-Lock Braking Systems (ABS). ABS is required in any other type of vehicle with air brakes that was manufactured on or after March 1, 1998.
11 . Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:
Driving uphill.
Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure drops to an unsafe level, the parking brake valve should pop out and spring brakes should come on.
12 . ABS brakes:
The purpose of an Anti-Lock Braking System (ABS) is to prevent a vehicle's wheels from locking up when the driver brakes hard on a slippery surface.
2025 Utah | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in Utah, you first need a valid Commercial Driver's License (CDL). Next, study the Doubles and Triples section of the Utah CDL handbook. Then, schedule and pass the Doubles/Triples knowledge test at a Driver License Division office. After passing the test, you'll receive your endorsement. Remember, driving experience with these types of vehicles is beneficial.
To obtain a CDL Doubles/Triples license, you need a valid Commercial Driver's License (CDL). Study the Doubles and Triples section of your state's CDL handbook. Then, schedule and pass the Doubles/Triples knowledge test at your local driving license office. Upon passing, you will receive your endorsement. It's also recommended to have hands-on experience with these types of vehicles.
While it's not a legal requirement to have specialized experience or training for a CDL Doubles/Triples endorsement, it's highly recommended. This is because driving these types of vehicles requires specific skills. Studying the Doubles/Triples section of the CDL handbook and passing the knowledge test is mandatory, but practical experience can significantly improve safety and confidence.
Yes, to receive a CDL Doubles/Triples endorsement in Utah, you must pass an additional written knowledge test specifically for Doubles/Triples. This test covers the special procedures and safety considerations associated with operating these types of vehicles. It is separate from the general CDL written test. You can prepare by studying the Doubles/Triples section of your state's CDL handbook.
For the CDL Doubles/Triples endorsement, there isn't a specific skills or maneuvers test as there is with the basic CDL. The endorsement only requires a written knowledge test. However, the test will cover topics like coupling and uncoupling, inspecting doubles and triples, and managing the vehicles during different situations. These are skills you'll need to safely operate these vehicles.
No, it is not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Utah. The endorsement is required by federal and state law to ensure that drivers have the necessary skills and knowledge to safely operate these types of vehicles. Driving without the appropriate endorsement can result in fines and penalties.
You can append the CDL Doubles/Triples endorsement to your current commercial driver's license. You don't need to initiate a new application for a CDL. However, you'll need to pass the Doubles/Triples knowledge test. After passing, the endorsement will be added to your existing CDL. Remember, there's no skills test for this endorsement in Utah.
Yes, there are some limitations for drivers with a CDL Doubles/Triples endorsement. For instance, they can only drive vehicles that their base CDL allows. Additionally, all federal and state regulations regarding hours of service, vehicle maintenance, and safety inspections must be followed. Violating these rules can result in penalties or loss of the endorsement.
In Utah, double trailers can be up to 81 feet long and triple trailers up to 105 feet long. The maximum weight for both is 129,000 pounds. However, these limits can vary depending on the specific highways and routes used. Drivers should always check local regulations and restrictions before operating these types of vehicles.
Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety guidelines. These include checking that all couplings are secure, maintaining extra following distance, and taking wider turns to avoid trailer off-tracking. Also, they must be aware of the "crack-the-whip" effect, which can cause a rollover. Federal regulations also apply, such as hours-of-service rules.