New Mexico CDL Air Brakes Practice Test (NM) 2

4.9 out of 5 (51 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready to ace your CDL air brakes practice test with our comprehensive preparation tool designed specifically for New Mexicans. This NM CDL air brakes practice test includes 20 carefully selected multiple-choice questions that cover all critical areas such as components, operation, safety inspections, and stopping distance calculations. The test ensures that you're not just memorizing facts but understanding key concepts, such as the importance of dual air brake systems, which provide an essential backup to enhance safety if one system fails. Our New Mexico CDL air brakes practice test is tailored to meet the specific requirements of the New Mexico DMV. We understand the unique challenges of driving in our state, from navigating mountainous terrains to dealing with extreme weather conditions, and our practice tests reflect this knowledge. In addition to the CDL air brake test, don't forget that you'll also need to pass the general knowledge test to obtain your commercial driver's license. We offer extensive resources for that as well, ensuring a well-rounded preparation. For those who learn visually, many of our NM driving test practice questions include images that help illustrate complex concepts, making them easier to grasp. This feature is especially beneficial for visual learners who need that extra bit of context to understand the material fully. By seeing diagrams of air brake systems or visual representations of stopping distances, you can better understand and retain the information. The variety of questions included in our New Mexico DMV practice test ensures a thorough preparation. With a large pool of potential questions, each session of our New Mexico CDL air brakes practice test provides a unique learning experience, helping to reinforce your knowledge and boost your confidence. To pass this CDL air brake test, you'll need to correctly answer 16 out of 20 questions, a standard that mirrors the real DMV air brake test. Don't leave your success to chance. Make the most of our learner's permit practice test to ensure you're fully prepared for the challenges of the NM air brakes CDL test. Whether you're a seasoned driver looking to add an endorsement or a new driver aiming to start your career on the right foot, our New Mexico practice permit test is your key to success.
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Sample New Mexico Air Brakes Test Questions

Question 1

In most large air-brake vehicles, spring brakes serve which functions?

  1. A. Parking only
  2. B. Normal service braking only
  3. C. Parking and emergency braking
  4. D. Routine speed control while driving

Correct answer: C. – Parking and emergency braking

The New Mexico CDL manual explains that spring brakes are commonly used to meet both parking- and emergency-brake needs. Air pressure holds the powerful springs back while the vehicle is being driven. Releasing or losing that air pressure allows the springs to apply the brakes; they are not the normal service brakes used for routine stops.

Source: New Mexico Commercial Driver’s License Manual — § 5.1.14, “Spring Brakes”

Question 2

When should you apply the parking brake on an air-brake-equipped vehicle?

  1. A. Only during vehicle inspections
  2. B. Whenever the vehicle is parked
  3. C. Only when parked on a grade
  4. D. While slowing for a normal stop

Correct answer: B. – Whenever the vehicle is parked

Apply the parking brake whenever you park. The service brake pedal is used to slow or stop the moving vehicle, while the parking brake holds it after stopping. Before leaving a vehicle unattended, make sure the parking brakes are applied or the wheels are properly chocked to prevent the vehicle from rolling.

Source: New Mexico Commercial Driver’s License Manual — § 5.1.15, “Parking Brake Controls”; § 5.4, “Using Air Brakes”

Question 3

What directly affects the braking power of spring brakes?

  1. A. The amount of fuel in the vehicle
  2. B. The condition of the air compressor belt only
  3. C. The driver’s ability to pump the brake pedal
  4. D. Proper adjustment of the brakes

Correct answer: D. – Proper adjustment of the brakes

Spring-brake effectiveness depends on proper brake adjustment. When the brakes are out of adjustment, the regular service brakes and the emergency or parking brakes will not work correctly. Brake adjustment is consequently important for both normal stopping and the mechanical braking supplied by the springs.

Source: New Mexico Commercial Driver’s License Manual — § 5.1.14, “Spring Brakes”

Question 4

At approximately what pressure does an air-compressor governor normally cut in?

  1. A. 80 psi
  2. B. 100 psi
  3. C. 125 psi
  4. D. 150 psi

Correct answer: B. – 100 psi

The governor normally allows the compressor to begin pumping when tank pressure falls to approximately 100 psi. This is called the cut-in pressure. When pressure rises to approximately 125 psi, the governor reaches cut-out and stops the compressor from pumping into the air tanks.

Source: New Mexico Commercial Driver’s License Manual — § 5.1.2, “Air Compressor Governor”

Question 5

Which foundation brake is most commonly used on heavy commercial vehicles?

  1. A. S-cam drum brake
  2. B. Wedge drum brake
  3. C. Disc brake
  4. D. Electric brake

Correct answer: A. – S-cam drum brake

Foundation brakes are the brake assemblies located at the wheels. The most common type on heavy commercial vehicles is the S-cam drum brake. When air pressure moves the brake chamber and slack adjuster, the S-cam rotates and presses the brake shoes against the inside of the drum.

Source: New Mexico Commercial Driver’s License Manual — § 5.1.8, “Foundation Brakes”

Question 6

If a vehicle’s ABS malfunctions, its regular brakes can still operate normally.

  1. A. TRUE
  2. B. FALSE

Correct answer: A. – TRUE

The New Mexico CDL manual states that normal brake functions remain available when ABS is not working. ABS helps prevent wheel lockup and improves control during hard braking, but it does not replace the regular braking system. Drive and brake normally, and have the malfunctioning ABS serviced soon.

Source: New Mexico Commercial Driver’s License Manual — § 5.4.2, “Braking with Antilock Brakes”

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