Brake master cylinder repair

Plan is to renew anything plastic or rubber in the braking system, clean all and the opportunity to upgrade to DOT5 and say goodbye to paint damage from brake liquid spills.
I red as well that Dot 5 doesn't collect moisture so that sounds great too.

From looking inside the brake master cylinder it was well needed. Bad news is I need new brake pistons.

Found it difficult to get the piston out of the brake master cylinder because it really fell like something was holding it inside but no way to get to it. Here is the procedure :
1. Remove the circlip at the end
2. Tap on newspaper to get the piston out or like I did get a bit of compressed air to help. Be careful it can really transform into a projectile.

Once out I realize that none of these rings seem to be the right size. I ordered the "fit most mk3 kit" stupid me, probably due to the fact that I have an early mk3 I have a single line brake circuit so I will need to order a different kit.

I think they must be starting to like me a lot where I order my parts :-)
For now, vacation and will continue when I return.