Free Practice Questions for Arkansas CDL Air Brakes Test

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Key Facts: Arkansas CDL Air Brakes Test Exam

80%

Minimum CDL Knowledge-Test Passing Score

49 CFR 383.135

60 psi

Low-Air Warning Threshold

Arkansas CDL Manual Section 5 / 49 CFR 393.51

20-45 psi

Typical Spring-Brake Automatic Application Range

Arkansas CDL Manual Section 5

150 psi

Safety Valve Setting

Arkansas CDL Manual Section 5

$50

Arkansas CDL License Fee

Arkansas DFA Act 753 notice

Prepare from Section 5 of the Arkansas Commercial Driver License Study Guide. Know the compressor governor cut-in and cut-out ranges, daily air-tank draining, low-air warning at or before 60 psi, spring-brake application around 20-45 psi, air buildup and leak-test limits, ABS behavior, brake lag, safe downgrade braking, parking controls, foundation brake inspection, and the older front-brake limiting valve concept. Arkansas requires a CDL-1 form and proof documents before CDL testing, and federal CDL rules require at least 80% correct to pass.

Sample Arkansas CDL Air Brakes Test Practice Questions

Try these sample questions to review concepts for the Arkansas CDL Air Brakes Test exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 220+ question experience with AI tutoring.

1What component compresses air for the air brake system?

A.The air dryer

B.The air compressor

C.The brake chamber

D.The slack adjuster

Explanation: The air compressor pumps air into the air storage tanks. It is driven by the engine, either through belts or directly. The air dryer removes moisture from the compressed air, the brake chamber converts air pressure into mechanical force at each wheel, and the slack adjuster transfers that force to the S-cam.

2What is the typical air compressor governor cut-out pressure range?

A.60 to 80 psi

B.100 to 125 psi

C.125 to 140 psi

D.150 to 175 psi

Explanation: The governor cuts out the compressor (stops pumping) at about 125 to 140 psi. It cuts back in (resumes pumping) at about 100 to 125 psi. This pressure range keeps the system safely above the low-pressure warning threshold of 60 psi while preventing over-pressurization.

3At what pressure does the air compressor governor typically cut IN to resume pumping?

A.60 to 80 psi

B.100 to 125 psi

C.125 to 140 psi

D.145 to 150 psi

Explanation: The governor typically cuts in at 100 to 125 psi, signaling the compressor to resume pumping. It cuts out at 125 to 140 psi when system pressure is sufficient. Together these limits maintain a safe operating range well above the 60 psi low-pressure warning.

4What is the purpose of the air dryer in the brake system?

A.To cool the air before storage

B.To remove moisture and oil before air reaches the tanks

C.To increase compressed air pressure

D.To warn the driver of low pressure

Explanation: The air dryer uses a desiccant cartridge to remove water vapor and oil from compressed air before it enters the storage tanks. Removing moisture prevents corrosion, contamination of brake components, and dangerous freezing of air lines in cold weather.

5What is the function of the wet tank (supply or service reservoir)?

A.It cools brake fluid

B.It is the first storage tank where moisture collects before air moves to the other tanks

C.It supplies air only to the trailer

D.It activates the parking brakes

Explanation: The wet tank is the first storage reservoir downstream of the compressor. Most moisture and oil that gets past the air dryer settles there before clean air moves on to the primary and secondary tanks. Drivers must drain the wet tank daily to prevent contamination of the rest of the system.

6At what pressure does the safety valve in the supply tank typically open to release excess air?

A.100 psi

B.125 psi

C.150 psi

D.200 psi

Explanation: The safety valve, installed in the supply (wet) tank, is set to open at about 150 psi. It is a backup that protects the system if the governor fails to cut out the compressor. If the valve releases, the compressor or governor needs immediate repair.

7What is the role of the foot valve (also called the treadle or service brake valve)?

A.It locks the parking brake

B.It supplies air to the brake chambers in proportion to how hard the driver presses the pedal

C.It drains water from the tanks

D.It controls the trailer air supply

Explanation: The foot valve (treadle valve) meters air to the brake chambers in proportion to how far the driver depresses the brake pedal. Pressing harder sends more air, applying more braking force. Releasing the pedal exhausts air from the chambers, allowing the springs and slack adjusters to release the brakes.

8What does the brake chamber do?

A.Stores compressed air for emergencies

B.Converts air pressure into mechanical force through a pushrod

C.Cools brake drums during use

D.Acts as a backup for the parking brake

Explanation: A brake chamber is a sealed housing with a diaphragm or piston. When air pressure enters, the diaphragm pushes a pushrod outward. The pushrod rotates the slack adjuster and S-cam, which forces the brake shoes against the drum to apply braking force.

9What is the role of the slack adjuster on an S-cam brake?

A.It cushions the impact of hard braking

B.It transfers force from the pushrod to the S-cam and can be adjusted to compensate for lining wear

C.It bleeds water from the system

D.It limits maximum air pressure

Explanation: The slack adjuster is a lever that connects the brake chamber pushrod to the S-cam. As the pushrod extends, the slack adjuster rotates the S-cam, which pushes the brake shoes against the drum. It can be adjusted to maintain proper pushrod travel as brake linings wear.

10What does the S-cam do in an S-cam drum brake?

A.It releases air from the lines

B.It rotates between the brake shoes, forcing them outward against the drum

C.It cools the brake drum

D.It activates the low-pressure warning

Explanation: The S-cam is an S-shaped piece of steel between the two brake shoes. When the slack adjuster rotates it, the wide part of the S forces the shoes outward against the drum, creating friction and slowing the wheel. When air pressure is released, return springs pull the shoes back and rotate the S-cam to its original position.

About the Arkansas CDL Air Brakes Test Exam

The Arkansas CDL Air Brakes Knowledge Test covers the information in Section 5 of the Arkansas Commercial Driver License Study Guide for drivers who operate trucks, buses, or other commercial motor vehicles equipped with air brakes. The test focuses on air-brake components, dual air systems, low-air warning devices, air pressure buildup, leak tests, spring and parking brakes, ABS, foundation brakes, slack adjusters, brake lag, emergency braking, cold-weather operation, and required inspection procedures. Arkansas DPS administers CDL written testing through Arkansas State Police troop testing sites, and applicants must follow Arkansas CDL-1 and documentation rules before testing.

Exam sponsor: Arkansas Department of Finance and Administration Driver Services / Arkansas State Police Driver Examination. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Arkansas uses the Commercial Driver License Study Guide for air-brake knowledge and requires applicants using air-brake vehicles in skills testing to pass the air brake test described in the manual. Federal rules require CDL knowledge tests to meet Part 383 standards and a passing score of at least 80%.

Time Limit

No single Arkansas-published time limit found for the Air Brakes written test

Passing Score

80% minimum

Exam / Certification Fees

CDL-1 test packet purchase required before testing; Arkansas CDL license fee is $50

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.

Core Section 5 domain

Air Brake System Parts

Compressor, governor, tanks, drains, alcohol evaporator, safety valve, brake pedal, foundation brakes, slack adjusters, air gauges, low-air warning, spring brakes, parking controls, and ABS.

Core Section 5 domain

Dual Air Brake Systems

Primary and secondary systems, pressure gauges, redundancy, spring brakes, parking controls, and what a driver should do when one system loses pressure.

Core inspection domain

Inspecting Air Brakes

Governor cut-out and cut-in, air buildup rate, static and applied leak checks, low-air warning, spring-brake pop-out, parking-brake and service-brake tests, and foundation-brake inspection.

Core operation domain

Using Air Brakes

Brake lag, normal stops, controlled braking, stab braking, ABS stops, brake fade, mountain grades, emergency braking, parking, and cold-weather moisture control.

Preparing for the Arkansas CDL Air Brakes Test Exam

What You Need to Know

Passing score: 80% minimum
Assessment: Arkansas uses the Commercial Driver License Study Guide for air-brake knowledge and requires applicants using air-brake vehicles in skills testing to pass the air brake test described in the manual. Federal rules require CDL knowledge tests to meet Part 383 standards and a passing score of at least 80%.
Time limit: No single Arkansas-published time limit found for the Air Brakes written test
Exam / certification fees: CDL-1 test packet purchase required before testing; Arkansas CDL license fee is $50 Official sources

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Arkansas CDL Air Brakes Test: Suggested Study Strategy

1Memorize the key air-brake numbers: governor cut-in/cut-out, 60 psi low-air warning, 20-45 psi spring-brake application, 150 psi safety valve, and leak-rate limits.

2Practice explaining each air-brake inspection step out loud, because Arkansas skills testing requires the air brake test described in the CDL Manual.

3Separate air-brake content from combination-only content unless the question involves trailer air supply or a combination leak-test limit.

4Understand why spring brakes are fail-safe: air pressure holds them off, and loss of air allows them to apply.

5Review ABS and emergency braking carefully; ABS helps maintain control but does not necessarily shorten stopping distance.

Frequently Asked Questions

Who administers the Arkansas CDL Air Brakes test?

Arkansas CDL written testing is administered through Arkansas State Police Driver Examination testing sites, while licensing is handled by Arkansas DFA Driver Services.

What score do I need to pass?

Federal CDL rules require at least 80% correct on each CDL knowledge test. Arkansas testing follows those federal CDL standards.

What should I bring before CDL testing in Arkansas?

Arkansas DPS says CDL applicants must purchase a CDL-1 form from a DFA Revenue Office before testing and bring a valid Arkansas driver license, current CDL-1 form, and proof of legal presence at each testing-center visit.

Does passing the Air Brakes knowledge test remove the L restriction by itself?

Passing the knowledge test is necessary, but a driver must also take the required skills test in a properly equipped air-brake vehicle and perform the air brake check when required to fully avoid or remove the L restriction.

What section of the Arkansas CDL guide should I study?

Study Section 5, Air Brakes. If you will pull a trailer with air brakes, also review the combination-vehicle air-brake checks in Section 6.

Where is Arkansas CDL written testing offered?

Arkansas DPS states that the written test for commercial driver licenses is administered at all Arkansas State Police troop testing sites.

Free Practice Questions for Arkansas CDL Air Brakes Test

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