2025 District of Columbia Cdl Air Brakes - Test 1
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. Friction inside a brake drum is caused when the brake shoes and linings:
Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.
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Key Data
Number of Tests: 18
Number of Question: 25
Passing Score: 20
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