Michigan CDL Air Brakes Practice Questions - Michigan CDL Air Brakes Knowledge Test Exam

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Under Michigan CDL Manual Section 5, after draining a tank, the next time air pressure builds, you notice the system is slow to build up to 100 psi. What is one likely cause?

A tire is low The drain valve was not fully closed, causing a continuous leak The truck has too many lights The trailer is missing

Correct Answer:

The drain valve was not fully closed, causing a continuous leak

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