Combination #2
Combination Vehicles Practice Test | New Mexico 2025 #2 Page 3 of 3
Train for FREE online with our New Mexico CDL combination vehicle 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 NM combination 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 DMV requirements for issuing a combination license may vary from state to state.
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15 . If the emergency air line loses pressure:
The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.
16 . Having anti-lock brakes on only one axle:
If a vehicle has anti-lock brakes on just one axle, the driver will still have more control during braking than they would without any anti-lock brakes.
17 . The trailer hand valve:
Never use the trailer hand valve while parking because doing so may release the air pressure from the braking system, releasing the brakes that are holding the vehicle in place. Instead, use the parking brake or wheel chocks.
18 . To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can check under the trailer for wheel speed sensors coming from the back of the brakes.
19 . The trailer hand valve should be used:
The trailer hand valve (also referred to as the "trolley valve" or "Johnson bar") works the trailer brakes and should be used only when testing them. Using the trailer hand valve while driving could result in a skid.
20 . When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
To test the trailer service brakes, you should first ensure that the braking system has a normal air pressure level, then release the parking brake. You should then move the vehicle forward slowly and apply the brakes with the hand control. If the trailer service brakes are working properly, you will feel the brakes activate.
2025 New Mexico | Frequently Asked Questions
A CDL Class B license in New Mexico is issued to drivers who operate commercial vehicles exceeding 26,000 pounds or towing vehicles not exceeding 10,000 pounds. This includes buses, dump trucks, tow trucks, or delivery trucks. It does not allow the operation of Class A vehicles but allows the holder to operate Class C vehicles if properly endorsed.
A Class B CDL license in New Mexico 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 typically includes buses, dump trucks, straight trucks, and segmented buses.
To obtain a Class B CDL in New Mexico, you must be at least 18 years old (21 for interstate driving), possess a valid New Mexico driver's license, pass a vision test, and successfully complete both a knowledge test and a skills test. Additionally, you must provide proof of identity, residency, and social security number.
In New Mexico, to qualify for a Class B Commercial Driver's License (CDL), you must be at least 18 years old. However, if you plan to drive commercially across state lines (interstate commerce), federal regulations require that you be at least 21 years old.
While not necessarily required, specific endorsements can be added to a Class B CDL based on the type of vehicle you plan to drive or the cargo you plan to transport. Endorsements include passenger, school bus, tanker, hazardous materials (HazMat), and double/triple trailers. Each endorsement requires passing a specific knowledge test and sometimes a skills test.
The Class B CDL skills assessment in New Mexico includes three parts: pre-trip vehicle inspection, basic vehicle control, and on-road driving. Applicants must demonstrate their ability to inspect their vehicle, control the vehicle at low speeds, and drive safely in typical traffic situations, including turns, intersections, railway crossings, and various types of roadways.
Yes, there are limitations for Class B CDL license holders in New Mexico. They are authorized to drive single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or any such vehicle towing another not in excess of 10,000 pounds. They cannot drive a vehicle that falls under the Class A CDL category.
Yes, in New Mexico, it is possible to take the written Class B CDL test in Spanish. However, federal regulations require that all CDL drivers must be able to read and speak English sufficiently to converse with the general public, understand highway signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, in New Mexico, you can request accommodations for the Class B CDL written exam if you have a disability. These accommodations are designed to provide equal access to the Motor Vehicle Division services. However, you must provide appropriate documentation of your disability and specify the type of accommodation needed when scheduling your exam.
Yes, you can retake the Class B CDL written test if you don't pass on your first attempt. New Mexico requires a waiting period of at least one day before retesting. Additionally, retesting may involve an additional fee. It's recommended to review the CDL manual and consider additional study or training before retaking the test to increase your chances of passing.