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Question:

When using any equipment or servicing any system that has schrader valves, it is critical to

A All of the above.
Explaination

When using any equipment or servicing any system that has schrader valves, it is critical to be vigilant of the following:
Inspect the schrader valve core for bends and breakage.
Replace any damaged schrader valve cores to prevent leakage.
Cap the schrader ports to prevent accidental depression of the valve core.