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

For Michigan CDL air-brake testing, what is an air-over-hydraulic brake system?

A purely hydraulic system A hybrid system in which air pressure assists the hydraulic master cylinder, used on some smaller CMVs A system without air at all A trailer-only system

Correct Answer:

A hybrid system in which air pressure assists the hydraulic master cylinder, used on some smaller CMVs

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