ISO: Disc Brake Master Cylinder for 1967 Barracuda

junkyardhero said

i don't understand the phrasing of your question?

are you asking about the piston size of the master? or are you asking about the brake push rod (pedal to master cyl)?

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Yes!
As I am mechanically challenged, I don't know if the size of the brake push rod translates into a problem for upgrading the MC.
Is it a one size fits all rod? Does it take a different size MC piston seal.
Just clueless about potential complications.