Free West Virginia DMV CDL — Air Brakes Practice Test 2026
The West Virginia CDL — Air Brakes knowledge test has ~25 questions, and you need ~20 correct (80%) to pass. Practice free with questions written from the official West Virginia driver handbook — every one has a clear explanation, and you can retake as often as you like with no sign-up.
Content reviewed against official driver handbooks · August 12, 2026
What's on the West Virginia written test
The West Virginia CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.
Based on the official West Virginia exam format — always confirm current details with your state DMV.
Practice by topic
Focus on one area at a time — each topic has its own set of West Virginia practice questions.
How to pass the first time
- Read the official West Virginia driver handbook at least once before test day.
- Practice by topic to find your weak spots, then fix them.
- Take full-length practice tests until you pass comfortably every time.
- Read every explanation — understanding beats memorizing.
West Virginia CDL — Air Brakes test — frequently asked questions
How many questions are on the West Virginia CDL — Air Brakes test?
The West Virginia CDL — Air Brakes knowledge test has ~25 questions, and you need ~20 correct (80%) to pass. Our practice tests mirror that format.
How many questions can I miss on the West Virginia CDL — Air Brakes test?
You can miss up to ~5 of the ~25 questions and still pass — you need ~20 correct, which is 80%.
Can I retake the practice test?
Yes — practice as often as you like, completely free. The questions and answer choices are shuffled each time.
Can I take the West Virginia practice test in Spanish?
Yes. Every question here is available in English and Spanish — switch languages anytime. Many states also offer the real knowledge test in languages other than English; confirm what West Virginia offers with your DMV.
Can I practice on my phone?
Yes. The practice tests work in any mobile or desktop browser — no app or sign-up needed — so you can study anywhere.
Are these the real DMV test questions?
No. Our questions are original, written from the current official West Virginia driver handbook to match the real test's topics and style. We are not affiliated with any DMV or government agency.
What's the best way to study?
Read the West Virginia driver handbook, practice by topic to target weak areas, and finish with full-length tests until you consistently pass.
Other West Virginia practice tests
Take the CDL — Air Brakes test in another state
Every West Virginia question is written from the official West Virginia driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free
West Virginia CDL — Air Brakes questions with answers
20 sample questions from the West Virginia CDL — Air Brakes question bank — each with the correct answer, a short explanation, and the section of the official handbook it comes from.
Show all 20 questions with answers
1. With the engine at a fast idle, your gauge climbs to about 125 psi and stops. You then pump the brake at idle until the gauge reads about 100 psi, and the needle starts to rise again. What has this shown?
Correct answer: The governor is cutting the compressor out and back in at about the expected pressures
This is the Step 7 governor check. Pumping should stop at about 125 psi, where the gauge quits rising, and resume at about 100 psi, where pressure begins to climb. The manual adds that the exact figures should be checked against the manufacturer's specifications.
Source: West Virginia Commercial Driver's License Manual — Section 5.3.3, Step 7 Final Air Brake Check
2. You are driving a truck with a dual air system. The primary gauge reads 110 psi, but the secondary has sagged to 50 psi. Going by the manual, should the low air warning be on?
Correct answer: Yes, because either system falling below 55 psi should trigger it
In a dual system the light and buzzer are meant to warn you before either system gets under 55 psi, not only when both are low. If that happens on the road, the manual says to stop right away and park safely.
Source: West Virginia Commercial Driver's License Manual — Section 5.2, Dual Air Brake
3. Which statement about a modulating control valve does NOT match the manual?
Correct answer: To park, you move the lever only partway and hold it there by hand
For parking, the manual says to push the lever to the end of its travel and secure it with the locking device, not to hold it partway. The other statements describe how the valve lets a driver bring the spring brakes on by degrees.
Source: West Virginia Commercial Driver's License Manual — Section 5.1.15, Parking Brake Controls
4. On a long downgrade in the proper low gear, a driver whose 'safe' speed is 40 mph keeps light, steady pressure on the brake pedal the whole way down to hold exactly 40. How does that differ from the manual's technique?
Correct answer: The manual has you brake firmly enough to drop about 5 mph below the safe speed, release, and repeat once speed climbs back
The manual's method is a series of applications, each firm enough that you feel the vehicle clearly slow and lasting about three seconds. In its example, with a 40 mph safe speed you brake down to 35 mph, let go, and brake again only when you are back at 40.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.6, Proper Braking Technique
5. A West Virginia applicant scores 78% on the air brakes portion of the CDL knowledge exam. Under the manual's knowledge test rule, is that a pass?
Correct answer: No, because at least 80% is required
West Virginia requires a score of at least 80% to pass the knowledge test, and 78% falls short. A failed portion can be taken again after a seven-day wait.
Source: West Virginia Commercial Driver's License Manual — Chapter III, Knowledge Test
6. Section 5 opens by saying who needs to read it. Which of these drivers is NOT on its list?
Correct answer: A driver of a hydraulic-braked truck pulling no trailer
The section is for anyone who wants to drive an air-braked truck or bus or pull an air-braked trailer. Trailer drivers are also sent on to Section 6, Combination Vehicles.
Source: West Virginia Commercial Driver's License Manual — Section 5, Air Brakes
7. One of the two systems in your dual air brake setup has dropped very low on pressure, though the truck still slows when you brake. What does the manual tell you to do?
Correct answer: Stop safely and get the air brake system repaired
With one system very low, the front brakes or the rear brakes are not fully working and stopping takes longer. The manual's instruction is to make a safe stop and get the system repaired, not to keep driving on part of your brakes.
Source: West Virginia Commercial Driver's License Manual — Section 5.2, Dual Air Brake
8. Section 5 describes several forms the parking brake control can take, depending on the vehicle's age. Which of these is NOT one of them?
Correct answer: A foot pedal to the left of the clutch
Newer vehicles have the yellow, diamond-shaped push-pull knob labeled 'parking brakes.' Older vehicles may have a round knob in blue, a differently shaped control, or a lever. A foot pedal is not among the forms the manual lists.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.8, Parking Brakes
9. At 55 mph the manual puts a number of feet on each of the four parts of an air-braked vehicle's total stopping distance. Which part is the shortest?
Correct answer: Brake lag distance
Brake lag adds about 32 feet at 55 mph on dry pavement. Section 2 gives 142 feet for perception, 61 feet for reaction and about 216 feet for braking at that speed, which is how the total comes to more than 450 feet.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.4, Stopping Distance
10. West Virginia's license-update instructions, the same ones that cover removing an air brake restriction, list two possible fees. What decides which one you pay?
Correct answer: Whether a knowledge test is required
The update fee is $32.50 when a knowledge test is required and $7.50 when no knowledge test is needed. When testing is required, the DMV mails the driver a CDL test card.
Source: West Virginia Commercial Driver's License Manual — Chapter III, Change Current Class of License (Upgrade)
11. Section 5 ties several problems to hot brakes. Which of these is NOT one of them?
Correct answer: The alcohol evaporator running dry
Heat is behind brake fade, it can damage parking brakes applied right after a steep downgrade, and the manual says brakes can go out of adjustment quickly when they are hot. The alcohol evaporator is a cold-weather device.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.5, Brake Fading or Failure
12. You are making an emergency stop with controlled braking when you find you must steer much farther to one side than a small movement of the wheel allows. What does the manual say to do with the brakes?
Correct answer: Release them, then get back on them as soon as you can
Controlled braking means keeping steering movements very small. When a bigger steering adjustment is needed, or the wheels lock, the manual says to let off the brakes and then reapply them as soon as possible.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.3, Emergency Stops
13. On a newer air-braked vehicle, which pairing of knob movement and result is right for the yellow parking brake control?
Correct answer: Pull out to apply the spring brakes; push in to release them
The diamond-shaped yellow knob is a push-pull control. Pulling it out puts the parking (spring) brakes on, and pushing it in lets them off.
Source: West Virginia Commercial Driver's License Manual — Section 5.1.15, Parking Brake Controls
14. The manual's figure of more than 450 feet to stop from 55 mph in an air-braked vehicle comes with conditions. Which of these is one of them?
Correct answer: Good traction and good brakes
The figure is for an average driver with good traction and brake conditions, and it includes about 32 feet of brake lag on dry pavement.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.4, Stopping Distance
15. West Virginia's chart lists CDL endorsements by letter, each with a fee, and restrictions by letter. Under which heading are air brakes handled, and with which letters?
Correct answer: Under restrictions, as letters L and Z
West Virginia's endorsements are F, H, N, P, T, S and X, and none of them is for air brakes. Air brakes come up under restrictions: L limits the driver to vehicles without air brakes, and Z bars full air brake equipped CMVs.
Source: West Virginia Commercial Driver's License Manual — Chapter III, Commercial Driver's License Types, Endorsements, and Restrictions
16. On the vehicle inspection test's air brake check, you have just held the foot brake down for a full minute and read the gauge. What does Section 11 have you do next?
Correct answer: Pump the foot brake quickly to fan the pressure down until the low air warning devices come on
Section 11 lists three steps. After the one-minute hold with the foot brake fully applied, you fan off the air by quickly pumping the pedal, and the buzzer, light or flag should activate before pressure gets under 55 psi or the manufacturer's level. The third step keeps fanning until the valves pop out.
Source: West Virginia Commercial Driver's License Manual — Section 11.1.2, Cab Check/Engine Start (Air Brake Check)
17. Your air tank gauge reads 48 psi. According to the manual, what should the low air pressure warning be doing at that point?
Correct answer: It should already be on
A visible warning has to come on before tank pressure drops below 55 psi (or, on older vehicles, half the governor's cut-out pressure). At 48 psi it should already be showing.
Source: West Virginia Commercial Driver's License Manual — Section 5.1.11, Low Air Pressure Warning
18. The manual warns against setting the parking brakes in two conditions and gives a different consequence for each. Which pairing is right?
Correct answer: Very hot brakes can be damaged by the heat; very wet brakes in freezing weather can freeze so the vehicle will not move
Parking brakes set on very hot brakes can be damaged by the heat, so the manual says to let hot brakes cool first. Set on very wet brakes in freezing temperatures, they can freeze and leave the vehicle unable to move.
Source: West Virginia Commercial Driver's License Manual — Section 5.4.8, Parking Brakes
19. To stay clear of an air brake restriction, a West Virginia applicant has to take the road skills test in an air-braked vehicle. According to the manual, who provides the vehicle for that test?
Correct answer: The applicant, because the state does not supply commercial vehicles for the test
The manual notes that West Virginia provides no commercial vehicles for the road skills test, so applicants bring their own, and it must be representative of the license class being tested. Testing in a vehicle without air brakes leads to the L restriction.
Source: West Virginia Commercial Driver's License Manual — Chapter III, CDL Skills Test
20. A brake drum can take only so much heat. What does the manual say too much heat can do?
Correct answer: Make the brakes stop working
Friction between the linings and the drum slows the vehicle but also makes heat. The harder and longer you brake, the more heat the drum has to absorb, and the manual warns that an excess can leave the brakes not working.
Source: West Virginia Commercial Driver's License Manual — Section 5.1.8, Foundation Brakes