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Exam Review

Key Facts: NV CDL Air Brakes Exam

80%

Minimum knowledge-test score

49 CFR 383.135

L

No Air Brakes restriction

Nevada DMV Commercial Driver Licensing

Z

No Full Air-Brake-Equipped CMV restriction

Nevada DMV Commercial Driver Licensing

4 parts

Modernized air-brake vehicle-inspection check

Nevada Commercial Driver License Handbook Section 11

Prepare for Nevada's air-brakes knowledge test and the skills needed to avoid or remove restrictions L and Z. The knowledge-test minimum is 80%; Nevada does not publish a fixed item count or time limit.

Sample NV CDL Air Brakes Practice Questions

Try these sample questions to review concepts for the NV CDL Air Brakes exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 130+ question experience with AI tutoring.

1Which Nevada CDL applicant must take the air-brakes knowledge test to avoid an air-brake restriction?
A.An applicant who will operate a CMV with full air brakes or air-over-hydraulic brakes
B.Only an applicant seeking a separate Air Brakes endorsement
C.Only a Class A applicant pulling two trailers
D.Every CDL applicant, even if the vehicle has only hydraulic brakes
Explanation: Nevada requires the air-brakes knowledge test for operation of CMVs equipped with air brakes, including air-over-hydraulic systems. Air brakes are handled through knowledge and vehicle-skills qualifications and restrictions, not through a separate endorsement.
2What minimum score applies to Nevada's CDL air-brakes knowledge test?
A.70%
B.80%
C.75%
D.90%
Explanation: Federal CDL standards require at least 80% on each knowledge test. Nevada does not publish a fixed air-brakes item count, so the percentage should not be presented as a guessed number of correct answers.
3What Nevada CDL restriction results when an applicant does not take or pass the air-brakes knowledge test?
A.Z — No full air-brake-equipped CMV
B.E — No manual transmission
C.L — No Air Brakes
D.O — No tractor-trailer
Explanation: Restriction L means the driver may not operate a CMV equipped with air brakes. It applies when the applicant does not qualify through the air-brakes knowledge and applicable skills requirements.
4An applicant passes the skills test in a CMV with air-over-hydraulic brakes rather than full air brakes. Which restriction is placed on the CDL?
A.L — No Air Brakes
B.M — No Class A passenger vehicle
C.V — Medical variance
D.Z — No full air-brake-equipped CMV
Explanation: Restriction Z bars operation of a CMV equipped with full air brakes when the applicant's skills test used an air-over-hydraulic system. This differs from L, which bars air-brake-equipped CMVs more broadly.
5What must a Nevada CDL holder generally demonstrate to remove an L restriction?
A.Pass the air-brakes knowledge test and the required skills testing in a representative full-air-brake CMV
B.Pay an endorsement fee without further testing
C.Pass only a passenger-vehicle inspection
D.Complete a private written affidavit about prior air-brake experience
Explanation: Removing an L restriction requires air-brakes knowledge qualification and skills testing in an appropriate air-brake-equipped vehicle. The skills portion demonstrates the air-brake inspection and vehicle operation required for the unrestricted privilege.
6What does Nevada DMV currently list for a driving skills test used to add or remove a restriction or endorsement?
A.$14 with no other charge
B.$30 for the skills test plus a $3.50 photo fee
C.$57.50 plus a $30 written-test fee
D.$141.50 for every restriction change
Explanation: Nevada's current commercial fee table lists a $30 driving-skills-test fee to add or remove a restriction or endorsement, plus a $3.50 photo fee. Other licensing transactions can carry different fees.
7A Nevada driver receives a new CLP to remove an air-brake restriction through skills testing. When may the driver take that skills test?
A.Immediately after the CLP is issued
B.Only after the CLP has been held for 90 days
C.After holding the CLP for at least 14 days
D.Only when the CLP is within 30 days of expiration
Explanation: Nevada applies a minimum 14-day CLP holding period before CDL skills testing, including a skills test needed for an upgrade or restriction removal that requires a new permit.
8Which sequence names the four air-brake checks in Nevada's modernized vehicle-inspection test?
A.Static leakage, horn, windshield wipers, and hydraulic reserve
B.Air dryer purge, brake-drum temperature, tire pressure, and ABS road stop
C.Compressor belt, trailer hand valve, service chamber stroke, and parking-brake release
D.Air gauge and governor cutoff, applied leakage, low-air warning, and emergency-brake activation
Explanation: Nevada's current handbook skills section organizes the air-brake inspection into four parts: gauge/governor cutoff, applied leakage, low-air warning, and emergency-brake activation. Missing any part is an automatic vehicle-inspection failure.
9During Nevada's modernized applied-leakage check, what maximum one-minute pressure loss is allowed after the system stabilizes?
A.3 psi for a single vehicle and 4 psi for a combination vehicle
B.2 psi for a single vehicle and 3 psi for a combination vehicle
C.4 psi for a single vehicle and 6 psi for a combination vehicle
D.No measurable pressure loss for either vehicle type
Explanation: With the engine off, parking brakes released, and service brake applied, the modernized test allows no more than 3 psi in one minute for a single vehicle or 4 psi for a combination vehicle after the initial pressure drop stabilizes.
10Which pressure result satisfies Nevada's modernized low-air warning and emergency-brake checks when no different manufacturer specification applies?
A.The warning activates at 90 psi, and the control pops out at 70 psi
B.The warning activates before 55 psi, and the parking-brake control pops out between 20 and 45 psi
C.The warning activates only below 20 psi, and the control never moves
D.Both devices activate together at exactly 60 psi
Explanation: Nevada's modernized inspection procedure requires the low-air warning to activate before pressure falls below 55 psi, or at the manufacturer's specified level, and the emergency parking-brake control to pop out between 20 and 45 psi, or as specified by the manufacturer.

About the NV CDL Air Brakes Exam

Nevada tests air-brake knowledge for drivers who will operate CMVs with full air brakes or air-over-hydraulic brakes. Air Brakes is not a separate endorsement: knowledge and representative-vehicle skills determine whether restrictions L or Z appear on the CDL. Nevada's current handbook covers components, dual systems, inspection, low-pressure warnings, emergency braking, and safe use, and its modernized vehicle-inspection section defines the four-part air-brake check used during skills testing. This resource is independent English-language four-option study practice, not official test questions, an official format simulation, or a substitute for hands-on skills preparation.

Exam sponsor: Nevada Department of Motor Vehicles. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Computer-generated multiple-choice air-brakes knowledge test. Applicants seeking to avoid or remove an air-brake restriction must also demonstrate the applicable air-brake inspection and driving skills in a representative vehicle equipped with the relevant brake system.

Time Limit

Not published by Nevada DMV

Passing Score

At least 80% on the knowledge test

Exam / Certification Fees

$30 for a driving skills test to add or remove a restriction or endorsement, plus $3.50 for a new photo. Original, transfer, permit, and other licensing transactions have separate charges.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Official weight not published

Nevada Air-Brake Restrictions

Who must qualify, restriction L, restriction Z, and representative-vehicle testing.

Official weight not published

Nevada Upgrade Process

Knowledge score, CLP hold, skills testing, and current fees.

Official weight not published

Modernized Air-Brake Skills Check

Gauge and governor cutoff, applied leakage, low-air warning, and emergency-brake activation.

Preparing for the NV CDL Air Brakes Exam

What You Need to Know

  • Passing score: At least 80% on the knowledge test
  • Assessment: Computer-generated multiple-choice air-brakes knowledge test. Applicants seeking to avoid or remove an air-brake restriction must also demonstrate the applicable air-brake inspection and driving skills in a representative vehicle equipped with the relevant brake system.
  • Time limit: Not published by Nevada DMV
  • Exam / certification fees: $30 for a driving skills test to add or remove a restriction or endorsement, plus $3.50 for a new photo. Original, transfer, permit, and other licensing transactions have separate charges. Official sources

Using Our Practice Resources

  • Work through all 130 available questions
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NV CDL Air Brakes: Suggested Study Strategy

1Study Section 5 for air-brake knowledge and Section 11 for the current vehicle-inspection procedure.
2Keep restriction L distinct from restriction Z and from CDL endorsements.
3Practice the complete four-part air-brake inspection in the representative vehicle used for skills testing.

Frequently Asked Questions

Is Air Brakes a Nevada CDL endorsement?

No. It is a knowledge and skills qualification. A driver who has not qualified receives restriction L, while testing only in an air-over-hydraulic vehicle can produce restriction Z.

How many questions are on Nevada's air-brakes knowledge test?

Nevada DMV does not publish a fixed item count. The passing standard is at least 80%.

What is required to remove an L restriction?

The driver must pass the air-brakes knowledge test and the applicable vehicle-inspection and driving skills in a representative full-air-brake CMV.

What are the modernized in-cab air-brake checks?

Nevada's handbook lists gauge and governor cutoff, applied leakage, low-air warning, and emergency-brake activation as four required parts.