Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > Brake master cylinder sizes - Jap stuff

[bradders]

another numpty (not Multi) question:
which is bigger 14mm or 5/8? Instincts tell me 5/8 is biggest looking at the bikes that are listed (and 1/2 being 13mm from dodgy memory)

[skidlids]

5/8" = 15mm ish
1/2" = 12.5mm ish

So sizes as they go up are

1/2"
13mm
14mm
5/8"
16mm
18mm
3/4"

I'll see if I can dig some out tomorrow, but the main priority tomorrow is to cure the carb leak on my Class B monster, probably only a sticking float.
Also tomorrow I have to decide if I should connect up its second caliper or remove it along with the second disc

[Ghost]

Some slight annomolies with Kevs sizing.

1/2" =12.7mm approx 13mm

9/16" =14.28mm approx 14mm

5/8" =15.875mm approx 16mm

11/16" = 17.46mm Nearer 17 than 18

3/4" = 19mm or as near as makes no difference.

Soory Kev just reread your post and it wasn't conversion but the size hierarchy

[skidlids]

Phil my list is based on Master cylinders I have
I'm pretty sure they are in the right order

[bradders]

coolio, about what I thought, so must be learning something

and Multi size brake? 16mm I suspect...

[skidlids]

748/916 etc use a 16mm front brake m/cyl for operating the two 4-pot calipers they come fitted wirh as standard, I found fitting one of these to a single caliper didn't give me anywhere near the feel that I wanted

[bradders]

no different to what I have then, but if the magura is too much I may stick it on the multi if I keep it

guess i should look at a ZXR400 size instead just in case, although I found the 19x20 I had was fine and that wasn't that different with two calipers as a ratio than 16mm with one

[skidlids]

And again the point is missed, its not just the piston diameter but the combination of the piston diameter and the lever ratio that also plays apart.

Magura recommend the 195 radial m/cyl with a 16mm diameter for bikes with two 4-pot calipers
Brembo recommend their 16 X 18 and 16 X 16 m/cyls for bikes using one 4-pot caliper