Alaska CDL Air Brakes Practice Test (AK) 2

5 out of 5 (35 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Getting your CDL air brakes endorsement is crucial for navigating Alaska's unique driving conditions. The Alaska CDL air brakes practice test is designed to prepare you thoroughly, featuring 20 multiple-choice questions that delve into vital topics such as air brake components, their operation, safety inspections, and stopping distance calculations. This Alaska-specific CDL air brake practice test ensures you're ready for the challenges posed by our diverse and often extreme weather conditions, such as icy roads and steep inclines. The Alaska DMV practice test offers an authentic and comprehensive preparation experience. Although the DMV restricts the publication of actual test questions, this permit test practice closely mirrors the real DMV test format. By covering identical topics and utilizing comparable phrasing, this Alaska permit practice test helps you grasp essential concepts, boosting your confidence and knowledge. Driving in Alaska presents unique challenges. Our roadways often traverse remote areas with limited services, and the unpredictable weather can turn a routine trip into a significant challenge. Understanding the importance of dual air brake systems is critical here, as they provide a safety backup in case one system fails, ensuring you maintain control over your vehicle even in adverse conditions. Additionally, the Alaska CDL air brake test covers state-specific information, ensuring you are well-versed in the regulations and road signs unique to Alaska. The DMV air brake test is not timed, allowing you to spend as much time as needed on each question, ensuring thorough understanding and retention of the material. To pass, you need to correctly answer 16 out of the 20 questions, making this Alaska CDL air brakes practice test a perfect tool to ensure you're fully prepared for the actual test. Whether you're navigating the busy streets of Anchorage or the remote highways of the Alaskan wilderness, this Alaska CDL air brakes practice test is your go-to resource for mastering the air brakes endorsement. Dive into this essential Alaska practice permit test to ensure you're ready for the road ahead.
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Sample Alaska Air Brakes Test Questions

Question 1

During normal travel, what keeps a vehicle’s spring brakes released?

  1. A. Compressed air pressure
  2. B. Mechanical spring force
  3. C. Wheel rotation
  4. D. Vehicle weight

Correct answer: A. – Compressed air pressure

Alaska’s CDL manual explains that compressed air holds the powerful brake springs back while the vehicle is being driven. When that air pressure is released or lost, mechanical spring force applies the brakes. This design allows spring brakes to serve as parking and emergency brakes.

Source: Alaska Commercial Driver License Manual — § 5.1.14, “Spring Brakes”

Question 2

What activates the stop-lamp switch in an air-brake system?

  1. A. A hand-operated control
  2. B. Air pressure from a service-brake application
  3. C. Hydraulic fluid pressure
  4. D. Spring-brake force

Correct answer: B. – Air pressure from a service-brake application

The stop-lamp switch is electrical, but it is operated by air pressure. Pressing the brake pedal sends pressure through the service-brake system and activates the switch. The switch then illuminates the brake lights to warn traffic behind the vehicle.

Source: Alaska Commercial Driver License Manual — § 5.1.12, “Stop Light Switch”

Question 3

Which system operates the brakes when the driver presses and releases the foot brake?

  1. A. Parking-brake system
  2. B. Service-brake system
  3. C. Emergency-brake system
  4. D. Air-compressor system

Correct answer: B. – Service-brake system

The service-brake system applies and releases the brakes during normal driving. It is controlled by the brake pedal, which is also called the foot valve or treadle valve. The parking-brake control operates a separate function, while the emergency system responds to a brake-system failure.

Source: Alaska Commercial Driver License Manual — § 5, “Air Brake System Parts”

Question 4

What force applies spring brakes when their releasing pressure is removed?

  1. A. Compressed air pressure
  2. B. Electrical current
  3. C. Hydraulic pressure
  4. D. Mechanical spring force

Correct answer: D. – Mechanical spring force

Spring brakes are applied by mechanical force rather than by air, hydraulic pressure, or electricity. During normal driving, compressed air holds the springs back. Releasing or losing that air allows the springs to apply the parking or emergency brakes.

Source: Alaska Commercial Driver License Manual — § 5.1.14, “Spring Brakes”

Question 5

Below what reservoir pressure must the low-air warning give a continuous warning?

  1. A. 80 psi
  2. B. 60 psi
  3. C. 50 psi
  4. D. 40 psi

Correct answer: B. – 60 psi

Federal Motor Vehicle Safety Standard No. 121 requires a continuous warning when service-reservoir pressure is below 60 psi. The signal must be visible, or both audible and visible, to the driver. A low-air warning requires prompt attention because continued pressure loss can reduce braking ability and eventually apply spring brakes.

Source: 49 CFR § 571.121, S5.1.5 — Standard No. 121; Air brake systems

Question 6

A supply-pressure gauge shows how soon the S-cam will rotate. True or false?

  1. A. True
  2. B. False

Correct answer: B. – False

A supply-pressure gauge displays the amount of air pressure available in the vehicle’s reservoirs. On a dual system, separate gauges or needles show pressure in the primary and secondary systems. It does not measure S-cam movement or indicate how long an S-cam will take to rotate.

Source: Alaska Commercial Driver License Manual — § 5.1.9, “Supply Pressure Gauges”

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