2025 District of Columbia Cdl Air Brakes - Test 2

The following questions are from real District of Columbia CDL practice tests. After selecting the answer, you can see the explanation. After confirming, click "Next" to jump to the next question.

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1. Most heavy-duty vehicles use:

Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.
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