2025 Tennessee Cdl Air Brakes - Test 1
The following questions are from real Tennessee 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. Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:
Air pressure falls below 45 psi.
Air pressure falls below 20 psi.
Driving downhill.
Driving uphill.
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Key Data
Number of Tests: 18
Number of Question: 25
Passing Score: 20
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