Brake conundrum

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"Engine can't be running when you bleed the system."

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I have never heard anyone state this before. Care to edit the comment?
Nope. Learned it back in high school shop class.
And as I said, if you scoff at me, refer back to the video I posted. Stated bluntly by Booster Steve, who took over Booster Dewey's business. One of the most respected classic booster rebuilders in the country. Right at about 24:18.