R Brakes on a 91 744

I have a line on a set of S60R Brake calipers and rotors from a friend of mine and I saw that its possible to put them on my 740. I know where to get the adapters to mount the calipers and I already have 18 inch Pegasus wheels off the same car the calipers are coming from, plus where to get the stainless lines and all that.

My question is, do I need to upgrade the master cylinder and/or booster on the car or will the stock booster/master set up work with these brakes?

(I realize this subject has probably been beaten to death, but my search-fu skills are seriously lacking as I seem to be finding conflicting info)

Leave the rest stock.

I would upgrade the master cylinder. Even if you have the 15/16" you won't have enough master.

wujek said:

Leave the rest stock.

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Ill probably do this and see where it gets me. If I notice anything, Ill go from there.

Texas240 said:

I would upgrade the master cylinder. Even if you have the 15/16" you won't have enough master.

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Ive read about the mustang master cylinder upgrade, Ill have to figure out what years of 'stangs I have to get one from if the need arises.

Maybe upgrade to 1-1/16" bore size master cylinder from Mustang. You could calculate the piston area of the calipers to determine the bore size increase needed.

http://www.tceperformanceproducts.com/bias-calculator/

I use a spreadsheet.