yep definately start with a 13/16 then i would say

id personally recommend trying at least a 13/16 bore master and see how you go from there..

reason being is because i ran an 11/16 master in my ute with a disc/drum combo and found that it required
a tiny bit too much pedal travel for my liking. It didnt bother me a whole lot but the deciding factor to go bigger
next time would be because on one occasion when i ran the front pads really low it ran out of pedal travel and
wouldnt apply enough brake until i replace the pads

Thanks 1200 but I don't need any info on front calipers I already have rebuilt ford xr8 calipers.i havent got any master yet as the car is still in the build.i don't want Nissan as they look #OOPS#house.wilwoids master at least looks nice as the car/engine bay is half a show car

dd is suggesting that instead of willwood/brembo etc - use Nissan, a great idea as they are cheap, cheap to service and cheap to replace pads

i guess you have a 7/8th master so try it, i suspect you will wish to change to a smaller one later, but you may as well try what you have installed already

the problem with the calculators is yes you need to know all your piston diameters, and probably have no idea what force you would like to aim for anyway, so it is easier just to do an install and try it

the bigger the brakes you put on the more leverage (in terms of force) the small master has, it just requires more stroke from a smaller master also. At the end of the day you will have to try it out and see no matter what anyone says on here

What have Nissan calipers got to do with a booster or not?

A good brand is Nissan -- Nissan make awesome 4-pot alloy calipers.

Nissan 4-spot brakes on 1200 strut

you get what you pay for, if you cant find a OEM part that suits your needs , AP racing or Brembo are hard to beat , but they are not cheap

If every1 dosnt like wilwood what's a good brand?

They use them because they are cheap

The Datsun master can be had in many bore sizes
So start with the basics if you already have one and work up or down depending what your leg likes
My 1000 conversions I have used 11/16 , 3/4 and 13/16 on my cars
And one customer even used 7/8 for his
So you can tailor it to suit your needs
All suitably modified for disc brakes of course

And as far as working out forumulas... they don't take into account hose flex , pad compressability , flex in the caliper bodies , movement on the slide pins and a number of other factors... so can only be used as a guide

Wards I was under the impression wilwood is good which is why most race/drag cars use them?