Looking at building up some new brakes and am getting confused with piston bore size and master cylinder sizing etc. Can somebody point me in the right direction ???
Thanks
Bob

I think datrotor would be the one to talk to,i pretty sure he's running wilwood setup.

Neil (dattoman1000) is the man here for that

Wilwood are not road legal last I heard

For racing situations only.
There are a number of equations involved in working it all out.
I can send you the spread sheet I developed but it is pretty confusing, my spread sheet isn't well labelled.
From a first principles POV you work out the braking g, which in combo with your CoG height and static weight distribution gives the longitudinal weight transfer.
Now you know the weight distribution you can work out the reactive torque your brakes need to produce based on your tyre diameter.
This will lead you to the circuit pressure required to produce that torque based on piston size, rotor diameter and pad friction.
That's where piston size comes in.
From that you can work out the M/C bore size based on foot pressure you want (Requires the motion ratio of your pedal box). This of course can be modified based on the bias you have set.

Or you can skip all this and use general rules......The more piston area you have the less circuit pressure you need to run.
The larger the disc diameter the less circuit pressure you need to run.
5/8" M/C for front circuit and 3/4" for the rears works for just about anything :)

Bryan

Willwood now make a dust sealed caliper, But as with all brakes the only stuff that is legal is engineered or stock.

Thanks for input guys but it does not seem feasible or possible to fit these under 13" wheels.Will persist with the Hilux/commodore combo and play with master cylinders etc

Not sure which Wilwood calipers you,are looking to use but I had Wilwood calipers on our sports racer and that had 13" wheels. I believe the calipers were twin piston Dynalites.

Tom

Hey Bob,
Definitely possible with the Wilwood 4 pot Dynalights. I've got them on the SSS with a ventilated aftermarket Ford Capri rotor- tight but it fits and they are absolutely awesume.
Cheers
Dave