Disc brake swap

I have a 68 fastback that I'm swapping disc brakes from a 79 granada for the old drums .Do I need to change the master cylinder?[img]/phpBB/images/smiles/icon_confused.gif[/img] thanks for any help[img]/phpBB/images/smiles/icon_spin.gif[/img]

Yes. You need a disc/drum mc.

Yes, you need a dual master and don't forget a proportioning valve!LOL and keep on stang-n
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I have a dual m.c.on the car now,and the p valve looks the same as the one i got with the brakes .What's the diff in the m.c.?[img]/phpBB/images/smiles/icon_confused.gif[/img] Thanks for the help [img]/phpBB/images/smiles/icon_bow.gif[/img]

Disc brakes require more flow to work. These mc's have a larger tank than a drum mc. Most dics/drum mc's have one large tank with a smaller tank. The pro. valve is also different. So when converting to this set-up, you need to change both to make it work correctly.