From Section 6 of the Maryland Commercial Driver’s License Manual

Maryland CDL Combination Vehicles Practice Test

Who takes it: Class A.

Tractor-trailers and trucks pulling a heavy trailer. 20 questions, 16 right to pass (80%).

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Practice Combination Vehicles

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Section 6 · p. 172–199 of the Maryland Commercial Driver’s License Manual (DL-151 (05/26))

Before lowering the drawbar eye onto a pintle hook, what must you do?

Tap an answer to see if you’re right, and the page

Your score on each part fills in as you study.

Rules for this test that the Maryland Commercial Driver’s License Manual prints and other states' manuals don't.

Uncoupling a Drawbar
The first step in uncoupling a drawbar is to make sure the trailer brake is on; then remove the rubber dust cover and loosen the screws. p. 194
Uncoupling a Gooseneck Hitch
To uncouple a gooseneck hitch, remove the safety pin and clip, rotate the handle and raise the trailer off the ball (the coupler returns to the load position on its own), then put the safety pin and clip back in. p. 196
Inspecting a Combination Vehicle
Inspect a combination vehicle with the same seven-step method used for a single vehicle; there are more items to check (tires, wheels, lights, reflectors) and some new ones, such as the coupling system. p. 196

Practice material, not the official test: check every answer in your state's current handbook. Disclaimer · How the rounds work · MVA

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