Thanks for your comprehensive reply!
The mechanic says that the air piston bit (the servo) is leaking and he is worried that the membrane inside is going to be perished or will perish eventually(?). He also said the master cylinder was leaking and super old (maybe the original from 1977!)
He said that it would be quicker in man hours to get new ones as then he just needs to stick it on and bleed the system (if i understood him correctly)
He said i could get new seals, but this would involve lots more man hours.
There isnt really anywhere else to take it to here,. we live in rural france and he is the only hgv garage for miles and lots of people here recommended him... so i am a bit stuck with him i guess.
For now i can keep driving it, as long as i keep checking the brake fluid levels, whilst i try to find the parts.
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