Alaska CDL Air Brake Test (AK) 2026

5 out of 5 (38 votes)
80% Passing score
20 Questions
4 Mistakes allowed
The Alaska CDL air brakes practice test on our site offers a thorough exploration of air brake systems through 20 multiple-choice questions. This Alaska air brakes CDL test dives deep into essential components such as compressors, reservoirs, and brake chambers. It also covers operational principles and critical safety protocols necessary for handling these systems. An essential aspect of this test is the inclusion of questions about brake lag time, a unique feature of air brakes. Understanding this concept is vital for drivers, as it influences stopping distances and overall vehicle control. Our Alaska permit practice test is designed with the latest updates for 2026, reflecting current driving laws and regulations. This ensures that learners are engaging with the most up-to-date and relevant information. Unlike dubious 'DMV test cheat sheets' that claim to offer quick fixes, our Alaska DMV practice test provides a legitimate and reliable study tool. These cheat sheets often pose risks and offer no guarantee of success, whereas our methodical approach has a proven track record of effectiveness. While the DMV does not release actual permit test questions and answers, our Alaska practice permit test simulates the real DMV permit test experience closely. The questions are crafted to cover identical topics and are designed with similar phrasing to help learners grasp crucial concepts. Achieving a passing score on this DMV air brake test requires correctly answering at least 16 out of the 20 questions, ensuring you are well-prepared for the air brakes endorsement on your commercial driver's license. Prepare for your Alaska CDL air brake test with confidence, knowing that our CDL air brake practice test offers a comprehensive, current, and authentic practice experience. Master the fundamentals required for safe and effective air brake operation, and take a significant step towards securing your commercial driver's license.
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Sample Alaska Air Brakes Test Questions

Question 1

At 55 mph on dry pavement, air-brake lag adds about 32 feet to stopping distance.

  1. A. TRUE
  2. B. FALSE

Correct answer: A. – TRUE

The Alaska CDL manual states that air-brake lag adds about 32 feet at 55 mph on dry pavement. Brake lag is the delay between pressing the brake pedal and the brakes beginning to work as air moves through the system. Under good traction and brake conditions, total stopping distance at that speed is more than 450 feet.

Source: Alaska Commercial Driver License Manual — § 5.4.4, “Stopping Distance”

Question 2

Which air-brake system is intended to help stop the vehicle if the service-brake system fails?

  1. A. Hand-brake system
  2. B. Drum-brake system
  3. C. Emergency-brake system
  4. D. Parking-control system only

Correct answer: C. – Emergency-brake system

The emergency-brake system is designed to help stop the vehicle during a brake-system failure. It uses parts of the service- and parking-brake systems rather than being a completely separate set of brakes. Spring brakes and related controls may provide emergency braking as air pressure is lost, but drivers should stop safely when a low-pressure warning first appears.

Source: Alaska Commercial Driver License Manual — § 5, “Air Brakes”

Question 3

During an air-pressure buildup test on a dual air-brake system, what should the gauges normally show at engine operating speed?

  1. A. Pressure rising from 85 to 100 psi within three minutes
  2. B. Pressure rising from 85 to 100 psi within 45 seconds
  3. C. The compressor cutting out at 75 psi
  4. D. The safety valve opening at 125 psi

Correct answer: B. – Pressure rising from 85 to 100 psi within 45 seconds

At normal engine operating speed, pressure in a dual air-brake system should generally rise from 85 to 100 psi within 45 seconds. Vehicles with air tanks larger than the minimum size may have a longer acceptable buildup time, so the manufacturer’s specifications should be checked. Do not drive if the system cannot build pressure at the required rate.

Source: Alaska Commercial Driver License Manual — § 5.3, “Inspecting Air Brake Systems,” “Check Air Compressor Rate”

Question 4

What additional factor makes an air-brake vehicle’s total stopping distance longer than that of a hydraulic-brake vehicle?

  1. A. Perception distance
  2. B. Reaction distance
  3. C. Brake-lag distance
  4. D. Following-distance allowance

Correct answer: C. – Brake-lag distance

An air-brake vehicle has perception distance, reaction distance, brake-lag distance, and braking distance. Brake lag is the added delay while compressed air travels through the lines and activates the brakes. Hydraulic brakes respond without this air-flow delay, although actual stopping distance for either system still depends on speed, traction, vehicle weight, and brake condition.

Source: Alaska Commercial Driver License Manual — § 5.4.4, “Stopping Distance”

Question 5

On newer air-brake vehicles, what color is the dashboard parking-brake control knob?

  1. A. Red
  2. B. Green
  3. C. Yellow
  4. D. Pink

Correct answer: C. – Yellow

The parking-brake control on newer air-brake vehicles is a yellow, diamond-shaped push-pull knob. Pulling the knob applies the parking or spring brakes, while pushing it in releases them when sufficient air pressure is available. Do not confuse it with the red trailer air-supply control found in combination vehicles.

Source: Alaska Commercial Driver License Manual — § 5.1.15, “Parking Brake Controls”

Question 6

Spring brakes most commonly provide which braking functions?

  1. A. Hydraulic service braking
  2. B. Normal air-powered service braking only
  3. C. Emergency and parking braking
  4. D. Trailer braking only

Correct answer: C. – Emergency and parking braking

Spring brakes are commonly used for parking and emergency braking. During normal operation, air pressure holds the springs back; releasing or losing that pressure allows the springs to apply the brakes. Federal equipment rules require appropriate emergency braking capability and require parking brakes to remain applied without depending on air, fluid, or electric energy.

Source: Alaska Commercial Driver License Manual — § 5.1.14, “Spring Brakes”, 49 CFR § 393.40 – Required brake systems, 49 CFR § 393.41 – Parking brake system

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