twin circuit master cylinder bore?

does anyone know the bore diameter of the 1500-1600/type 3, twin circuit, brake master cylinder?

is it 23mm or 19mm or what?

I have one to suit the type 3 rear brakes I have, but I think it's the same as the beetle units.

Only reply if you know for sure please. I am trying to fix my brake bias issues and I need exact figures.

yep type 1 and 3 are the same 19mm.

And the rear wheel cylinders are also 19mm

thanx dave, :kiss

If you are looking the play with the bias the easiest way to do that is with different sized wheel cylinders.

Another point of interest is a Porshe 944 Master Cylinder apparently has a different bore for front and rear of the dual circuit.

For more info on Changing over your master cylinder and a few more options that could be considered check this site out:

http://www.airsouls.com/how-tos/master_cylinder.htm

By no means complete, but interesting all the same.

I actually can't do anything with wheel cylinders coz I already have 23mm cyls in my rear type 3 wagon breaks, and the front brakes are discs.🙁

But,

I have found a solution to the bias issue I think. I have a Volks conversions front disc set up and after talking to John Sherman, I am using the next size smaller bore Mazda caliper (than the one I have now).

This will also improve the pedal feel abit too, should only cost around $100. And I can keep the bugger calipers for later if I ever want to go to monster discs on the back. My engineer is happy with this too... :thumb

But thanx for the tips. Buggies are an enigma to even the most experienced dubber, so it's nice to have some experienced people on hand.
:kiss

[Edited on 9-9-2004 by pete wood]