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Thought I was almost done with the Granada swap on my '67 coupe, but not yet. I changed out the MC from my '67 dual res. to a '73 Mustang disk / drum manual MC, but the pusher rod is too long. Can I use a '67 MC (drum/drum) on the granada swap? I kind of remember somehting about disk brakes either needing more OR less fluid displacement to work right. With the new forum, I can't find the answer with the searches (no one asked before?) Any help would be great.

67 red Couple, in process of restomod (only been 2 years so far)
 

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You can't use a drum master cylinder with disc brakes and get any good out of it. If you look closely at a disc/drum master cylinder the resevoir for the disc side is bigger. Disc calipers require more brake fluid to compress than the slave cylinder in a drum.

My understanding is pretty basic but the pushrods for power brakes are all longer because of the booster. It sounds to me like you have a power disc master cylinder.

I'm running 71 mustang discs on my car with a MANUAL disc master cylinder for a 77 Granada. I got a rebuilt one from OReilleys for cheap. They had it in stock and it works great. These are fairly common and more likely to still be on the shelf somewhere than one for a 71-73 mustang. The manual disc MC's have a larger plunger so that they push more fluid volume for the same brake pedal throw. The larger plunger also reduces pedal effort some which is very necessary for good manual disc brakes.


You can see my 65 fastback at: http://hottarod.stangnet.com/
http://members.aol.com/macstang/Gifs/macstang3.jpg
 
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