Vermont Air Brakes Test
You're not driving on flat land. Learn how air brakes handle Vermont's mountain passes, frost heaves, and logging roads before you hit the test.
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This is the Vermont Air Brakes test — 25 questions, 80% to pass. You'll need it for any commercial vehicle with air brakes in this state.
Key Topics
- •Air brake system parts
- •Dual circuits & emergency braking
- •Inspection & slack adjuster checks
About the Vermont Air Brakes Test
Topics Covered
- ✓Air brake system components — Vermont examiners want you to know the parts that freeze up in our winters, like the alcohol evaporator and air dryer.
- ✓Dual air brake systems — Understand the primary and secondary circuits. On I-91's long downgrades, losing one circuit isn't a drill.
- ✓Brake lag and stopping distance — Vermont's deer population doesn't give you extra stopping time. You need to know how air brake lag affects your total distance.
- + 3 more topics
📘 Study Tips & State Info
Here's what I tell my students at the Montpelier DMV: don't just memorize the manual — understand how air brakes behave in Vermont conditions. When the manual talks about moisture in the air system, picture a November morning on Route 7 with frost on your tanks. When it says to check brake stroke, think about a logging truck that's been hauling maple sap down a muddy road.
The Vermont DMV examiners are big on the pre-trip inspection. They'll ask you the steps in order, and they expect you to know the exact pressure ranges: governor cut-out at 120-130 psi, cut-in at 95-105 psi, low air warning at 60 psi. Don't skip the alcohol evaporator — that's a Vermont winter-specific item. You'll see questions about it.
Practice with our simulator. It's set to 25 questions with a 30-minute timer, just like the real test. Review the sections on brake lag and stopping distance carefully — those are the ones that trip people up. And remember: if you're driving a vehicle with air brakes in Vermont, this test isn't just a hurdle. It's the difference between making it down the hill and not.
The Vermont DMV administers the Air Brakes test at all CDL testing offices. You'll find them in Montpelier (main office), Rutland, South Burlington, St. Johnsbury, and other regional locations. You need an appointment for CDL written tests — walk-ins aren't guaranteed. Call ahead or book online. The test fee is included in your CDL permit application fee, which is about $45 as of 2025.
Vermont requires a valid Medical Examiner's Certificate at the time of testing. If you're applying for a Class A CDL with air brake endorsement, you'll take this test alongside the General Knowledge test. Vermont does not have a separate air brake restriction test — either you pass the air brakes test and get the endorsement, or you get an L restriction that limits you to vehicles without air brakes.
One thing Vermont DMV examiners watch for: they know our roads have unique challenges. They'll ask about brake system checks in cold weather, and they expect you to know that Vermont requires functioning alcohol evaporators in some commercial vehicles during winter months. Stay up to date on state-specific rules — the Vermont CDL manual has a section on winter operation.
About the Vermont Air Brakes Test
Vermont's roads aren't like anywhere else. You've got the steep grades on I-89 coming out of the Winooski Valley, the tight curves on Route 100 through the Green Mountains, and winter conditions that'll test your air brake knowledge every single day. The Vermont Air Brakes test covers the federal standards, but the DMV examiners here pay special attention to how you handle cold-weather brake operations.
This test is required for any CDL applicant who will operate a vehicle equipped with air brakes — that's most Class A and many Class B rigs in Vermont. The test has 25 multiple-choice questions, and you need 20 correct to pass. That's 80%, same as the federal requirement. You'll take it at your local Vermont DMV office, and they expect you to know the system cold.
Vermont examiners are practical. They've seen brake failures on the Bolton Flats in winter. They know what happens when you don't drain your air tanks on a cold morning. The questions on this test aren't just theory — they're about keeping you and everyone else safe on roads that can go from dry pavement to black ice in a mile.
You'll find questions about dual air brake systems, slack adjusters, brake lag, and emergency braking. But the real focus is on inspection and maintenance. Vermont doesn't have weigh stations on every corner, but you'd better believe the DMV expects you to do a proper pre-trip on your air brakes every time.
Topics Covered
Study Tips
Here's what I tell my students at the Montpelier DMV: don't just memorize the manual — understand how air brakes behave in Vermont conditions. When the manual talks about moisture in the air system, picture a November morning on Route 7 with frost on your tanks. When it says to check brake stroke, think about a logging truck that's been hauling maple sap down a muddy road.
The Vermont DMV examiners are big on the pre-trip inspection. They'll ask you the steps in order, and they expect you to know the exact pressure ranges: governor cut-out at 120-130 psi, cut-in at 95-105 psi, low air warning at 60 psi. Don't skip the alcohol evaporator — that's a Vermont winter-specific item. You'll see questions about it.
Practice with our simulator. It's set to 25 questions with a 30-minute timer, just like the real test. Review the sections on brake lag and stopping distance carefully — those are the ones that trip people up. And remember: if you're driving a vehicle with air brakes in Vermont, this test isn't just a hurdle. It's the difference between making it down the hill and not.
Vermont Specific Information
The Vermont DMV administers the Air Brakes test at all CDL testing offices. You'll find them in Montpelier (main office), Rutland, South Burlington, St. Johnsbury, and other regional locations. You need an appointment for CDL written tests — walk-ins aren't guaranteed. Call ahead or book online. The test fee is included in your CDL permit application fee, which is about $45 as of 2025.
Vermont requires a valid Medical Examiner's Certificate at the time of testing. If you're applying for a Class A CDL with air brake endorsement, you'll take this test alongside the General Knowledge test. Vermont does not have a separate air brake restriction test — either you pass the air brakes test and get the endorsement, or you get an L restriction that limits you to vehicles without air brakes.
One thing Vermont DMV examiners watch for: they know our roads have unique challenges. They'll ask about brake system checks in cold weather, and they expect you to know that Vermont requires functioning alcohol evaporators in some commercial vehicles during winter months. Stay up to date on state-specific rules — the Vermont CDL manual has a section on winter operation.