Saw Mill, Since you have the master cylinder out, try applying some heat (a general purpose propane or Mapp gas torch will do) to warm up the clevis/pin a little, then hit it with some of that penetrating oil. The heat will encourage the penetrating oil to get down into the space where it's bound up and hopefully free it up. May take a few go-rounds, but that's worked for me in the past when freeing up such things. Don't forget to protect the rest of the cylinder from direct heat.


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)