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Massachusetts Air Brakes Test

You'll need to stop smoothly on I-93's steep grades near Boston — this test makes sure you can.

118

Questions

80%

To Pass

Minutes

118 questions · 30 min time limit · 80% to pass

Opens in a practice window — choose your mode inside.

Reviewed by Jack Mahana, CDL Instructor (13+ years)

Last verified: August 2026

All questions sourced from the official Massachusetts CDL handbook and FMCSA regulations.

About the Massachusetts Air Brakes Test

Massachusetts has some of the trickiest roads for air brake drivers. The Big Dig tunnels demand precise stopping distances. Winter ice on the Mass Pike can make brake fade a real threat. You don't just need to know air brake theory — you need to apply it to real New England conditions.

Commercial trucks in Massachusetts haul everything from seafood to construction materials. Tight downtown streets in Boston and Cambridge mean you'll often stop and go. Your air brakes must respond fast. Our practice test covers the specific scenarios Massachusetts CDL drivers face every shift.

We built this test around the Massachusetts CDL handbook. Every question matches the RMV's air brake endorsement exam. You'll learn about slack adjusters, low-pressure warnings, and brake balance. Don't waste time on generic questions — this content is made for Massachusetts roads.

Use this test to find your weak spots. Take it again until you score 80% or higher. You'll walk into the RMV service center confident. Let's get you that air brake endorsement.

Topics Covered

✓Brake adjustment – critical for tight clearances in Boston's tunnels and underpasses

✓Compressor governors – prevent over-pressurization on long downgrades like the Berkshire sections of I-90

✓Low-pressure warning systems – you'll hear that buzzer on icy Route 2 hills

✓Spring brake parking brakes – vital for parking on steep inclines in western Mass towns

✓Brake fade – a real danger when braking repeatedly on the Southeast Expressway

✓Pre-trip inspection – Massachusetts RMV expects you to check brake components daily

Study Tips

Study the Massachusetts CDL manual's air brakes section first. Don't skip the diagrams — they show how air flows through the system. Focus on the brake adjustment process. The RMV examiner will ask you to demonstrate it.

Schedule your air brakes knowledge test online through Mass.Gov. You'll need to take it at an RMV service center. Bring your learner's permit and pay the $40 endorsement fee. If you fail, you can retake it the same day after a short wait.

Practice with our test a few times. Read each explanation carefully. They connect the question to a real Massachusetts driving situation. That's what makes the difference on test day.

Massachusetts Specific Information

Massachusetts requires you to pass a separate air brakes knowledge test before you get the endorsement on your CDL. You can take this test at any RMV service center that offers CDL services. Popular locations include Wilmington, Worcester, and Fall River. You must make an appointment online — no walk-ins.

The fee for the air brakes endorsement is $40. You pay when you schedule the test. If you pass, the endorsement will appear on your license immediately. You don't need a separate driving skills test for air brakes unless you're also adding a new CDL class.

Bring your current CDL learner's permit or license to the test. You'll get a paper copy of your results. Keep that until your plastic license arrives. The endorsement is valid for the same period as your CDL.

Frequently Asked Questions

Do I need a separate air brakes endorsement in Massachusetts?

Yes. If your vehicle has air brakes, you must pass the Massachusetts Air Brakes knowledge test to get the 'L' endorsement on your CDL. There's no separate skills test for it.

How do I schedule the Massachusetts air brakes test?

Go to Mass.Gov/RMV and book an appointment at a service center that offers CDL knowledge tests. Pick a date and time that works for you. Pay the $40 fee online.

Where can I take the air brakes test in Massachusetts?

You can take it at many RMV service centers. Popular ones include Wilmington, Worcester, Fall River, and Springfield. Check Mass.Gov for the full list and make an appointment.

What's the passing score for the Massachusetts air brakes test?

You need to answer at least 80% of the 25 questions correctly. That's 20 out of 25. If you don't pass, you can retake it the same day at the same location.

Can I use the RMV air brakes manual to study?

Absolutely. Download the free Massachusetts CDL handbook from Mass.Gov. The air brakes section is about 30 pages. Our practice test covers the same material, so using both is the best way to prepare.

Reviewed by Jack Mahana, CDL Instructor (13+ years)

Last verified: August 2026 · FMCSA-compliant content