Georgia CDL Air Brake Test (GA) 2026

4.8 out of 5 (89 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Prepare yourself thoroughly for the Georgia CDL air brake endorsement with our Georgia CDL air brake practice test. This resource is designed to help you grasp the essential elements of air brake systems, ensuring you're well-prepared for the actual DMV air brake test. Our practice permit test consists of 20 multiple-choice questions, each crafted to challenge your understanding of key components like compressors, reservoirs, and brake chambers. By tackling these questions, you'll not only learn about the operational principles but also master the critical safety protocols necessary for effective air brake usage. One unique feature of the air brakes CDL test is its inclusion of questions on brake lag time. This aspect of air brakes is crucial as it directly affects stopping distances and overall vehicle safety. Our GA DMV practice test will help you comprehend how to calculate and compensate for this lag, ensuring you're prepared for real-world driving scenarios. To support your learning, the Georgia CDL air brake test provides immediate feedback on each question. This feature allows you to understand why a particular answer is correct or incorrect, aiding in retention and comprehension. Detailed explanations accompany each piece of feedback, reinforcing your knowledge and helping you avoid common mistakes. The questions you'll encounter on the Georgia CDL air brake practice test are sourced directly from the official GA driver's manual. This ensures that you're studying relevant and accurate information. Since the real DMV permit test is based on the same manual, practicing with our questions will give you a significant advantage. Our Georgia driving test practice offers a diverse range of questions to thoroughly prepare you for the DMV written test. With a large pool of permit test questions and answers, you can expect to cover every possible topic that might appear on the actual test. Achieving a passing score of 80% (at least 16 correct answers) will give you the confidence and knowledge needed to secure your CDL air brake endorsement. Start practicing with our Georgia CDL air brake practice test today and take a significant step towards mastering the fundamentals required for safe and effective air brake operation.
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Sample Georgia Air Brakes Test Questions

Question 1

In an older air-brake system, what is a wig-wag?

  1. A. A mechanical arm that drops into view when air pressure is low
  2. B. A mounting device for the air compressor belt
  3. C. A switch that operates the brake lights
  4. D. A valve used to drain an air tank

Correct answer: A. – A mechanical arm that drops into view when air pressure is low

A wig-wag is a mechanical low-air-pressure warning device found on some vehicles. Its arm drops into the driver’s view when system pressure falls below the specified level; the Georgia manual uses 55 psi for this description. An automatic type rises when pressure is restored, while a manual-reset type must be moved out of view by hand.

Source: Georgia Commercial Driver’s Study Guide — § 5.1.11, “Low Air Pressure Warning”

Question 2

Which air-brake component helps reduce ice formation in valves and other system parts?

  1. A. An air-compressor heating unit
  2. B. An air-storage-tank blanket
  3. C. An alcohol evaporator
  4. D. A one-way check valve

Correct answer: C. – An alcohol evaporator

An alcohol evaporator introduces alcohol into the air system to reduce the risk of ice forming in valves and other components during cold weather. Ice inside the system can interfere with brake operation. The alcohol container should be checked and filled as needed during cold weather, and the air tanks must still be drained unless automatic drain valves are used.

Source: Georgia Commercial Driver’s Study Guide — § 5.1.5, “Alcohol Evaporator”

Question 3

On a long or steep downgrade, how should the service brakes be used after the proper low gear is selected?

  1. A. As a supplement to the engine’s braking effect
  2. B. As the only means of controlling vehicle speed
  3. C. Continuously, to keep the brake drums hot
  4. D. To permit the transmission to remain in neutral

Correct answer: A. – As a supplement to the engine’s braking effect

Select the proper low gear before beginning the downgrade so the engine can provide the principal braking effect. The service brakes should supplement engine braking rather than provide continuous speed control by themselves. Excessive brake use creates heat and may cause fading or failure, leaving insufficient braking power when a stop is required.

Source: Georgia Commercial Driver’s Study Guide — § 2.16.2, “Select the Right Gear Before Starting Down the Grade”, Georgia Commercial Driver’s Study Guide — § 2.16.4, “Proper Braking Technique”

Question 4

Which procedure correctly tests an air-brake system’s low-pressure warning signal?

  1. A. Shut off the engine, turn on electrical power, and repeatedly press and release the brake pedal
  2. B. Push inward on each slack adjuster with the parking brake applied
  3. C. Release the parking brake and pull hard on the slack adjusters
  4. D. Drive above 20 mph and make a sudden stop

Correct answer: A. – Shut off the engine, turn on electrical power, and repeatedly press and release the brake pedal

In Georgia’s CDL inspection guidance, the engine is shut off after sufficient pressure has built, and electrical power is left on. Repeatedly pressing and releasing the brake pedal lowers tank pressure. The low-pressure warning must activate before pressure falls below 60 psi in the tank, or in the lowest-pressure tank of a dual system.

Source: Georgia Commercial Driver’s Study Guide — § 5.3.3, “Step 7 Final Air Brake Check—Test Low Pressure Warning Signal”

Question 5

Under good traction and brake conditions, an air-brake vehicle traveling at 55 mph has a total stopping distance of about 100 feet.

  1. A. True
  2. B. False

Correct answer: B. – False

The statement is false. Air-brake lag alone adds about 32 feet at 55 mph on dry pavement. When perception distance, reaction distance, brake-lag distance, and braking distance are combined, the total stopping distance for an average driver under good conditions is more than 450 feet.

Source: Georgia Commercial Driver’s Study Guide — § 5.4.4, “Stopping Distance”

Question 6

In a vehicle with dual parking control valves and a separate air tank, the reserve air can be used to:

  1. A. Balance the primary and secondary service-brake systems
  2. B. Keep the vehicle parked without applying spring brakes
  3. C. Increase normal service-brake pressure during travel
  4. D. Temporarily release the spring brakes to move the vehicle in an emergency

Correct answer: D. – Temporarily release the spring brakes to move the vehicle in an emergency

Some vehicles use a separate air tank and dual parking control valves to release the spring brakes when main air pressure has been lost. This permits limited emergency movement of the vehicle. Georgia’s air-brake section cautions that the reserve tank can perform this function only a few times, so the movement must be planned carefully.

Source: Georgia Commercial Driver’s Study Guide — § 5.1.15, “Parking Brake Controls—Dual Parking Control Valves”

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