[rdorman]

Here I go again!

Assumption, you have a single, tandom, master cylinder and you are going to a dual master cylinder/balance bar setup up, the new peddles will have the same mechanical advantage, you are not changing to or from a power brake system, the brakes balance you have now is good and the proportioning valve does not reduce initial pressure and last but not least you are happy with the peddle effort you have....... phew! Is that correct? Any one of these changes the answer.

I will do some more reading this evening if time allows, but here goes nothing!

Going to dual master cylinders from single halves the amount of pressure the master cylinder sees from your foot. Sooooooooo, if your master cylinder now is a 1" bore you will need a front master cylinder of half the area. Not diameter, area. .70 master cylinder being about 2% small and a .75 being about 13% large (less and more relative peddle pressure). Be aware that the master cylinder you have may have two sizes in it, one for front and one for rear.

Now is the time to address any issues related to the first paragraph in here. Choose wisely grasshopper.

I have all the math at home.

Rick