About the rear brake cylinder.
It is now clear that the “window” of the rear brake cylinder is not a separate spare part. Also, the brake cylinder without the window is not an original spare part. The price of the new cylinder is 135 €. The good thing is that the price also includes a new piston with cuffs. But still, the price is high to repair the mistake of the manufacturer. So what, in fact, is a good solution? At the moment I can think of such variants:
1. Focus on the correct and good brake fluid in the future and hope that the new brake cylinder (or rather the window on its side) lasts at least as long as the first one, i.e. 64000km.
2. Remove the existing cylinder and weld the window should. Perharps it is possible? I would be happy to receive comments on this solution.
3. Try to find a suitable brake cylinder from other bike models and rebuild the system a little bit. There, of course, will be other things to consider, from fastenings, to the suitability of the levers to the hoses.
Already in the winter, when I was preparing the bike for the trio, I was advised to throw the ABS away. At that time, I could not do it. It spent a lot of time and money on redevelopment, new hoses, etc. Today I can say that I should have been listening and just thrown it away. If we ever get home with the bike then I’ll do it.