New Hampshire CDL Air Brakes Practice Test (NH) 2

5 out of 5 (45 votes)
80% Passing score
20 Questions
4 Mistakes allowed
If you're gearing up for the NH CDL air brake test, you're in the right place. Our New Hampshire CDL air brake practice test is tailored to give you the edge you need to ace your endorsement test. This DMV written test practice is packed with 20 thoughtfully curated multiple-choice questions designed to cover every critical aspect of air brake systems, ensuring you're well-prepared for the real test. With a passing score requiring at least 16 correct answers, you'll be able to gauge your knowledge and readiness with precision. You'll delve into key topics such as components, operation, safety inspections, and stopping distance calculations. You'll gain insights into essential facts like dual air brake systems, which are crucial for enhancing safety and providing a reliable backup if one system falters. Our NH drivers test practice is accessible online, whether you prefer studying on your desktop, mobile phone, or even through our mobile app, making it convenient for busy drivers across the Granite State. New Hampshire's diverse driving conditions, from the bustling streets of Manchester to the winding roads of the White Mountains, demand that drivers are well-versed in handling all sorts of challenges. This NH air brakes CDL test will help you understand the nuances of operating a commercial vehicle in our unique local environments, ensuring you are not only prepared for the test but also for real-world driving scenarios. Unlike many costly paid options, our DMV air brake test is completely free, offering the same level of comprehensive preparation without any financial burden. To maximize your preparation, consider supplementing this New Hampshire CDL air brake practice test with additional resources like the driver's handbook, a state-certified driver's ed course, flashcards, and road sign charts. These materials can help you cover every facet of the DMV permit test thoroughly. Embark on your journey to become a licensed commercial driver in NH by leveraging this valuable tool to secure your air brakes endorsement confidently and efficiently.
FREE CDL Practice Test App
Pass your New Hampshire CDL Air Brake test with the NextDoorDriving app. Real questions and answers—100% free and ad-free.
Download on the App Store

Sample New Hampshire Air Brakes Test Questions

Question 1

Which procedure tests whether the low-air-pressure warning activates at the proper pressure?

  1. A Park, shut off the engine, turn on electrical power, and repeatedly apply and release the brake pedal
  2. B Push inward on each slack adjuster
  3. C Release the parking brake and pull firmly on each slack adjuster
  4. D Make a hard stop while traveling at least 20 mph

Correct answer: A – Park, shut off the engine, turn on electrical power, and repeatedly apply and release the brake pedal

The New Hampshire manual directs you to reduce tank pressure by repeatedly applying and releasing the brake pedal while the engine is off and electrical power is on. The warning must activate before pressure falls below 60 psi in the air tank, or in the lowest-pressure tank of a dual system. A failed warning must be repaired before the vehicle is driven.

Source: New Hampshire Commercial Driver’s License Manual — § 5.3.3, “During Step 7: Final Air Brake Check”

Question 2

Which condition can reduce the effectiveness of both service brakes and spring brakes?

  1. A Low hydraulic-fluid level
  2. B Brakes that are out of adjustment
  3. C A disconnected trailer air line
  4. D Normal governor cut-out pressure

Correct answer: B – Brakes that are out of adjustment

Spring-brake force is applied through the same foundation-brake components used during normal braking. If those brakes are out of adjustment, the service brakes and the emergency or parking brakes may not work properly. Brake adjustment must be inspected regularly because wear and frequent brake use can allow brakes to move out of adjustment.

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

Question 3

A lightly loaded vehicle is less likely to skid when spring brakes apply automatically after air pressure is lost.

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

Lightly loaded vehicles may skid out of control when spring brakes apply, especially on slippery pavement. Spring brakes can begin applying when system pressure drops into the manufacturer’s specified range, generally 20 to 45 psi. It is safer to stop while enough air remains to make a controlled stop with the service brakes.

Source: New Hampshire Commercial Driver’s License Manual — § 5.4.7, “Low Air Pressure”

Question 4

A low-air-pressure warning while driving requires you to stop and safely park as soon as possible.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

New Hampshire’s CDL manual instructs drivers to stop and safely park when the low-air warning activates. Enough tank pressure may remain for controlled service braking, but the spring brakes will begin applying if pressure continues falling into the manufacturer’s specified range, generally 20 to 45 psi. Waiting may result in an uncontrolled or skidding stop.

Source: New Hampshire Commercial Driver’s License Manual — § 5.4.7, “Low Air Pressure”

Question 5

On a long, steep downgrade, service-brake use should supplement the braking effect of the engine.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

Engine braking should be the principal method of controlling speed on a long or steep downgrade. After selecting the proper low gear, use the service brakes periodically to reduce the vehicle to about 5 mph below the selected safe speed, then release them. Riding the brakes continuously can produce excessive heat, brake fade, and eventual brake failure.

Source: New Hampshire Commercial Driver’s License Manual — § 2.16.4, “Proper Braking Technique”

Question 6

How do you check whether the spring brakes apply automatically as air pressure falls?

  1. A Release the parking brakes and repeatedly apply and release the brake pedal while parked
  2. B Apply the parking brakes and hold the brake pedal down
  3. C Make a hard stop while traveling at least 20 mph
  4. D Repeatedly apply and release the parking-brake control

Correct answer: A – Release the parking brakes and repeatedly apply and release the brake pedal while parked

With the vehicle secured and the engine off, release the parking brakes and repeatedly apply and release the brake pedal to reduce tank pressure. On a tractor-trailer, the parking-brake and tractor-protection controls should pop out when pressure reaches the manufacturer’s specified range, generally 20 to 45 psi. This action applies the spring brakes.

Source: New Hampshire Commercial Driver’s License Manual — § 5.3.3, “During Step 7: Final Air Brake Check”

More New Hampshire CDL Practice Tests
Other CDL Endorsements