[rdorman]

Generally you go with the same size master cylinder and slave. If you really want to figure it out you will need to know:
- throwout bearing to pressure plate gap as recommended
- distance that pressure plate 'fingers' need to be depressed
- measurements on the throw out bearing arm (from slave cylinder to bell house mount to throw out bearing center line) to determine how much throw out bearing travel you have for a given slave cylinder travel.

Call the manufacturer for specs or check their website.

From there you can see what you need. For instance, if for everyinch of travel of the slave cylinder you get half an inch of bearing movement and 1/4 of an inch is the total distance you need to move the throw out bearing then you will need a master cylinder that at MINIMUM will displace enough fluid to move the slave 1 inch. If you went with the minumum (I won't) then you will probably have a BUNCH of peddle travel.

Mine is one to one. I think most are. If you want a clutch that feels like a Toyota then go with a smaller master cylinder. If you want it to feel like a bulldozer, then a bigger one. Remember, the bigger the master cylinder the less peddle travel required and the greater the effort required.

As for the brakes, email me. I have a spread sheet that will get you in the right direction.

Rick