2011 GTS Master Cylinder seal rebuild kit

[kawasaki]

I'm having issues with my 2011 GT sponge like break pedal. This problem started when I made a ''hard abrupt stop'' at the lights.
I've bench bled the master cylinder twice and flushed the break fluid system five times with a Motive Bleeder. Pressurizer the system to 15 psi while a helper mash/pump the breaks slowly throughout the whole bleeding process, but the outcome is always the same with a spongy pedal.
Is there a complete seal repair kit for the Bosch Master Cylinder, if so could someone shear the link.
Thanks Steve

 

[Zep]

I haven’t been able to locate a rebuild kit for this up to now, but I think I remember someone having their master cylinder rebuilt by a specialist. They aren’t tricky to dismantle but Bosch don’t list the models the rebuild kits cover by part number so it might be trial and error.

 

[philw696]

Haven't rebuilt one since the mid 90's it's all about liability when it comes to repairs like that.
It's a bit different doing it on a 60's car with 60 BHP as opposed to a Exotic Italian with 400 plus.