Very long brake pedal travel

[Craigwilson]

I all ready have a 23mm master cylinder on it which is bigger than the 16v MC, And trust me it's not that I'm comparing it when I depress my pedal it's only an inch off the floor

[Craigwilson]

And also my front callipers are twin pots and I was told minimum size of MC that will push them is 23mm

[Gambit]

Ahh my mistake you have the S2 calipers, yeah bigger master cylinder needed s2 had the 25mm master cylinder

[Simeon]

Bigger master cylinder is not needed, I have the same set up with 23.3 mm Audi master cylinder and the pedal is firm and brakes are spot on.

[VW BUSH]

If you have more volume in your callipers a standard MC will have more pedal travel 

[Simeon]

If you have more volume in your callipers a standard MC will have more pedal travel 

Which is why he's using a larger master cylinder..

[Craigwilson]

So could my MC be faulty ? Because I have a spare new one I could swap it with.

[Simeon]

Could be. Did you clamp the compensator when bleeding? Have you tried removing the calipers and hanging them from the struts to get them up higher when bleeding? I had a bit of trouble getting the last bit of air out of my twin pots last time I bled them.

[Craigwilson]

Yeah the compensator was opened, I don't think there's air in the system because the brakes are good and the pedals not spongy it justs moves a lot, but no harm in trying

[VW BUSH]

If you have more volume in your callipers a standard MC will have more pedal travel 

Which is why he's using a larger master cylinder..

So the 1.0 mm increase over the 16v mc in piston area is equal to the volume you need to displace for the bigger twin pot callipers over the same stroke length?
Forgive me if this has been calculated and I have just not read the post properly