Maryland CDL Combination
Maryland CDL Combination Knowledge Test
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ExploreAbout this exam
The Maryland CDL Combination Vehicles knowledge test is the written exam a driver must pass to add the Class A combination-vehicle endorsement path to a Maryland commercial learner's permit or CDL. It matters most to people who intend to pull a tractor-trailer or a truck plus trailer, where the coupling, pivot points, and air brake systems behave very differently from a single-unit truck. The test is drawn from the combination vehicles portion of the state CDL manual and is typically organized around four themes: pre-trip inspection and coupling/uncoupling procedures; safe driving of combination units, including turns, braking, off-tracking and speed control; air brake and brake system checks specific to multi-unit vehicles; and skid control, rollover prevention and hazard response. Expect multiple-choice items that reward precise procedural order - for example, the sequence of steps for a safe coupling, or the correct order of an air brake leakage test - rather than general road intuition. To prepare, work through the current Maryland CDL manual combination vehicles chapter, practice the coupling and uncoupling sequence out loud until it is automatic, and drill the brake checks by hand on real equipment if you have access. Note that the Maryland MVA CDL pages and manual link were unavailable at the time this page was compiled, so verify current test details directly with the MVA.
What you'll study
About Maryland CDL Combination preparation
What does the Maryland CDL Combination Vehicles test cover?
It covers four areas: inspection and coupling/uncoupling of combination units; driving them safely, including turns, braking, off-tracking and speed control; air brakes and brake system checks; and skid control, rollover prevention and hazard response. Questions are multiple choice and test procedural order as much as general knowledge.
How many questions are on the test and what score do I need to pass?
We could not verify the question count or passing score. The Maryland MVA CDL landing page and CDL manual PDF both returned page-not-found errors when checked for this page, so treat any number you see elsewhere as unconfirmed and confirm it with the MVA before test day.
How long is the test and is there a fee?
Not verified. The source pages that would carry the time limit and fee were unavailable (404 errors) at the time of writing. Check the current MVA CDL pages under Licenses & IDs, or call the MVA Contact Center at 410-768-7000, for current timing and fee information.
If I fail, how soon can I retake the combination test?
The retake policy could not be confirmed from the available source material. Maryland's CDL pages currently live under the Licenses & IDs section of mva.maryland.gov rather than the older /drivers/ path, so start there or contact the MVA directly for the current waiting period and any retake fee.
Which study material should I use?
Use the current Maryland CDL manual's combination vehicles chapter as your primary text, since the knowledge test is drawn from it. Supplement with the air brake and inspection chapters, because combination questions frequently depend on brake-system and pre-trip knowledge. Avoid undated third-party summaries that may reflect older editions.
What is the most common reason candidates miss combination questions?
Getting the order wrong. Coupling, uncoupling and air-brake leakage checks are sequential procedures, and test items often list plausible steps out of order. Memorize the sequence rather than the individual steps, and practice saying each procedure aloud in order before you attempt the exam.
Do I need the combination test for a Class B license?
Combination knowledge applies when you will operate a vehicle combination with a separately towed unit, which is the Class A path. If you only intend to drive single-unit trucks, focus on the general knowledge and air brake tests instead, and confirm your specific endorsement needs with the MVA.
Where can I find the official Maryland CDL manual now?
The MVA homepage lists Commercial Driver's License (CDL) under Licenses & IDs, and a separate Commercial drivers entry under Your MVA guide. The older /drivers/Pages/ and /drivers/Documents/ URLs no longer resolve, so navigate from the homepage rather than using old bookmarks or links.