748r etc using 4 pad callipers

[andyb]

Does anyone know if the models like 748r that use the 4 pad callipers, have a different master cylinder to the std 2 pad bikes?

[Jools]

No, I don't know.

But, I upgraded to 4 pad calipers on my ST and they are quite happy with the standard ST master cylinder so you probably don't need to change it

[andyb]

What about the size of the bore then?

[rcgbob44]

If you are still using a four piston caliper then the original master cylinder should be ok, you will of course benefit by fitting a later more up to date master cylinder.

The only time you really have to change the master cylinder is when you change from a two piston caliper to a four piston type, then you need the extra capacity/ratio of a master cylinder suited to a four piston caliper.

As a point of interest, I chnaged the original 2 piston calipers on my Jota to four piston Brembo`s and fitter AP Lockheed ajustable ratio master cylinders which I can only praise in terms of performance and quality of construction.

[neil748r]

Back to the original question, the M/C is the same.