Received a new AC Delco single chamber master cylinder today. In the box was a red warning sticker that said “Warning Do Not Bench Bleed this master cylinder. If bench bled you will damage the cylinder.” I have never encountered this before. Could someone more knowledgeable than me explain? Thanks


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
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