Free Practice Questions for AK CDL Air Brakes
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7 Job WikiKey Facts: AK CDL Air Brakes Exam
80%
Minimum score on every Alaska CDL knowledge test
Alaska CDL Manual
55 psi
Low air warning must come on before tank pressure falls below this
Alaska CDL Manual Section 5.1.11
20-45 psi
Range where tractor and straight truck spring brakes come fully on
Alaska CDL Manual Section 5.1.14
0.5 sec+
Air brake lag before the brakes work
Alaska CDL Manual Section 5.4.4
100 psi
Minimum pressure in both dual systems before driving
Alaska CDL Manual Section 5.2
L
Restriction placed if the air brake test or check is not passed
Alaska CDL Manual Section 1
Study Section 5 of the Alaska CDL Manual for the Air Brakes knowledge test, which needs 80% to pass. Alaska's manual gives the governor cut-in at about 100 psi and cut-out at about 125 psi, a low air warning before 55 psi (80 to 85 psi is common on large buses), spring brakes at 20 to 45 psi, and per-minute leakage limits of 2 psi static and 3 psi applied for a single vehicle (3 and 4 psi for a combination). To avoid the L restriction, you also do the air brake check on a road test in a vehicle with full air brakes. Alaska DMV fees are $15 for the permit, $100 for a CDL ($120 REAL ID), and $25 for the road test.
Sample AK CDL Air Brakes Practice Questions
Try these sample questions to review concepts for the AK CDL Air Brakes exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 213+ question experience with AI tutoring.
1According to the Alaska CDL Manual, air brakes are really three different braking systems. Which three?
2What does the emergency brake system use to stop the vehicle when the brake system fails?
3How is the air compressor connected to the engine, according to the Alaska CDL Manual?
4The air compressor on your vehicle has its own oil supply. What does the Alaska CDL Manual say to do?
5At about what tank pressure does the governor stop the compressor from pumping (the cut-out level)?
6At about what pressure does the governor let the compressor start pumping again (the cut-in level)?
7According to the Alaska CDL Manual, how much braking can the air storage tanks support if the compressor stops working?
8Why does the Alaska CDL Manual say compressed air tanks must be drained?
9Your air tanks have manual drain valves. How often does the Alaska CDL Manual say you must drain them yourself?
10How are manual air tank drain valves operated, according to the Alaska CDL Manual?
About the AK CDL Air Brakes Exam
The Alaska CDL Air Brakes Knowledge Test is the Alaska Division of Motor Vehicles test for drivers of commercial vehicles with air brakes, including air over hydraulic brakes. It is based on Section 5 of the Alaska CDL Manual: air brake system parts, dual air systems, inspecting air brakes, and using air brakes. Failing or skipping it, or road testing without full air brakes, leads to an L or Z restriction. This free bank is independent practice by OpenExamPrep built from the current Alaska manual, which uses its own figures, such as a 55 psi low air warning and brake lag of one half second or more.
Exam sponsor: Alaska Division of Motor Vehicles. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
Air Brakes is not an endorsement in Alaska. The written knowledge test on Section 5 of the Alaska CDL Manual (80% to pass) is required for vehicles with air brakes, including air over hydraulic brakes. You must also identify air brake components and perform the air brake check on the road skills test in a vehicle with full air brakes, or Alaska places an L or Z restriction on the license. This bank is an independent multiple-choice study aid, not a copy or simulation of the official test.
Time Limit
not-published
Passing Score
80% minimum on every Alaska CDL knowledge test (Alaska CDL Manual)
Exam / Certification Fees
$15 commercial instruction permit; $100 standard CDL or $120 REAL ID CDL; $25 commercial vehicle road test
Exam sponsor websiteFees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
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.
Air Brake System Parts
Compressor, governor, tanks, drains, alcohol evaporator, safety valve, foundation brakes, gauges, warnings, spring brakes, parking controls, and ABS.
Dual Air Brake Systems
Primary and secondary systems, minimum pressure before driving, and partial system failure.
Inspecting Air Brakes
Slack adjusters, drums and linings, governor checks, leakage limits, warning and spring brake tests, buildup rate, and brake tests.
Using Air Brakes
Stopping, ABS, emergency braking, brake lag, stopping distance, fade, downgrade braking, low air, and parking brakes.
Alaska Air Brake Licensing
Who takes the test, L and Z restrictions, removing L, and the 80% standard.
Preparing for the AK CDL Air Brakes Exam
What You Need to Know
- Passing score: 80% minimum on every Alaska CDL knowledge test (Alaska CDL Manual)
- Assessment: Air Brakes is not an endorsement in Alaska. The written knowledge test on Section 5 of the Alaska CDL Manual (80% to pass) is required for vehicles with air brakes, including air over hydraulic brakes. You must also identify air brake components and perform the air brake check on the road skills test in a vehicle with full air brakes, or Alaska places an L or Z restriction on the license. This bank is an independent multiple-choice study aid, not a copy or simulation of the official test.
- Time limit: not-published
- Exam / certification fees: $15 commercial instruction permit; $100 standard CDL or $120 REAL ID CDL; $25 commercial vehicle road test Official sources
Using Our Practice Resources
- Work through all 213 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
AK CDL Air Brakes: Suggested Study Strategy
Frequently Asked Questions
Is Air Brakes an endorsement in Alaska?
No. Air Brakes is a knowledge test and skills requirement, not an endorsement. The Alaska CDL Manual says an L restriction is placed on the license if you do not pass the Air Brakes knowledge test, cannot identify the components, do not properly conduct the air brake check, or do not take the skills test in a vehicle with full air brakes.
What is on the Alaska CDL Air Brakes knowledge test?
The test is based on Section 5 of the Alaska CDL Manual: air brake system parts, dual air brake systems, inspecting air brakes, and using air brakes. The Alaska DMV does not publish the number of questions, and every CDL knowledge test requires at least 80% to pass.
Why does this practice use 55 psi for the low air warning?
The current Alaska CDL Manual says the low air warning must come on before tank pressure falls below 55 psi, matching 49 CFR 393.51 for older vehicles. Some other manuals and practice sites use 60 psi; for the Alaska test, study the Alaska manual's figures.
Is this the official Alaska Air Brakes test?
No. This is free, independent practice by OpenExamPrep, written in English multiple-choice format from the Alaska CDL Manual and Alaska DMV pages. It is a study aid, not a copy or simulation of the official knowledge or skills test.