Air Brakes #2
Air Brakes Endorsement Test | North Dakota 2025 #2 Page 3 of 4
Train for FREE online with our North Dakota 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 ND 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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13 . Friction inside a brake drum is caused when the brake shoes and linings:
Create excess heat.
Friction inside a brake drum is caused when the brake shoes and linings push against the inside of the drum. The friction in the drums will slow and stop the vehicle.
14 . If using the spring brakes while hauling a heavy load, a complete stop will:
Damage the brakes.
Spring brakes will activate in a vehicle with air brakes if the pressure in the air system becomes too low. A heavily loaded vehicle will take a long time to stop when using only the spring brakes because the spring brakes do not work on all axles.
15 . Why do large vehicles use air brakes?
Air is free.
Air brakes are an effective and safe way of stopping large and heavy vehicles, as long as they are maintained and used properly.
16 . The safety valve located on the first tank opens:
After every stop.
In an air brake system, the first tank that receives compressed air has a safety valve that releases air if the pressure gets too high. It is usually set to open at 150 psi. If the valve must open, there is a fault in the system that should be repaired by a mechanic.
17 . The ____ tells a driver how much pressure is in the air tanks.
Drum brake
A vehicle that is equipped with air brakes must also be equipped with a supply pressure gauge. This gauge tells the driver how much air pressure is in each of the vehicle's air tanks.
18 . The application pressure gauge:
Shows the number of times the brakes have been used.
In an air brake system, the application pressure gauge shows how much air pressure is being applied to the brakes. Not all vehicles with an air brake system have this gauge.
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2025 North Dakota | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in North Dakota, you must first hold a valid Commercial Driver's License (CDL). Then, you will need to pass the Doubles/Triples Knowledge test. The test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling. After passing this test, the endorsement will be added to your CDL.
To obtain a CDL Doubles/Triples license, you first need a valid Commercial Driver's License (CDL). Then, you must pass the Doubles/Triples Knowledge Test. This test covers topics such as coupling and uncoupling, inspecting doubles and triples, and handling. After passing the test, the Doubles/Triples endorsement will be added to your CDL.
While North Dakota does not mandate specific training for a CDL Doubles/Triples endorsement, they do require passing the Doubles/Triples Knowledge Test. However, practical training can be beneficial for understanding coupling/uncoupling, inspecting, and handling doubles/triples. Some drivers opt for professional training programs to enhance their skills and increase their chances of passing the test.
Yes, in North Dakota, to obtain a CDL Doubles/Triples endorsement, you must pass the Doubles/Triples Knowledge Test. This written exam covers topics like coupling and uncoupling, inspecting doubles and triples, and handling. The endorsement is added to your CDL after you successfully pass this exam.
The CDL Doubles/Triples endorsement test in North Dakota is a knowledge test, not a skills test. It focuses on understanding specific rules and procedures related to operating such vehicles. Topics include coupling and uncoupling, inspecting doubles and triples, and crucial handling differences. Practical skills or maneuvers are not demonstrated during this written test.
No, it's not permissible. In North Dakota, like in all other states, you must have a valid CDL Doubles/Triples endorsement to legally operate double or triple trailers. Driving without the appropriate CDL endorsement is a violation and could result in fines, penalties, and potential disqualification from driving commercial vehicles.
You can append the CDL Doubles/Triples endorsement to your current commercial driver's license in North Dakota. You don't need to initiate a new application for a CDL. However, you must pass the Doubles/Triples Knowledge Test to get the endorsement. Once you pass, the endorsement is added to your existing CDL.
Yes, there are constraints. Drivers with a CDL Doubles/Triples endorsement in North Dakota must only operate vehicles that their license classifies. For instance, a Class B CDL holder can't operate a Class A vehicle. Additionally, all federal and state regulations regarding hours of service, vehicle maintenance, and safety must be strictly adhered to.
In North Dakota, double trailers can't exceed 81 feet in overall length. For weight, the maximum gross vehicle weight (GVW) is 105,500 lbs. However, specific weight depends on the vehicle's axle configuration. Triple trailers are not generally permitted unless on specific routes or for emergency relief efforts. Always check with the Department of Transportation for up-to-date regulations.
Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety guidelines. These include conducting pre-trip safety inspections, ensuring the correct coupling and uncoupling of trailers, and managing the high rollover risk associated with these vehicles. Drivers must also be aware of the increased stopping distance required for double/triple trailers and adjust their driving accordingly.
