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I just finished rebuilding my Drum Brakes and now need to deal with the plumbing and such. My Master Cylinder needs a rebuild but I like those bracket adapters that allow the dual Master to be used. Somewhere in my feeble mind a switch was thrown that told me I had a new Mustang Master Cylinder packed away someplace. After about 15 minutes, I found it. Still has the cosmolene and plastic plugs protecting the ports.
I don't want to go the booster route or anything special. The stock set-up works fine for my (old fart) driving. I just thought the dual set-up would be an added measure of safety. The pistion in this Cylinder measures 1.020 diameter.
What year Mustang? disc front and drum back? or drum front and drum back? the fluid capacity of each might make a difference, in addition to any proportion valve, if needed. I'm kinda guessing here.
I'm no brake expert either, but it seems to me that a 1.00+ bore is for power brakes. It will still work, but will be a HARD pedal. I think you need a 3/4" dia piston as the drum brakes need less fluid volume to operate and the smaller bore gives higher pressure with less leg power.
Or is that the part of my brain I lost with the stroke...I can't remember.