No leaks so I am installing a master cylinder out of a 855 manual wagon.
The MC reservoir on the turbo has a spring and ball loose inside of it. I searched high and low and cannot find any reference to what it is for (or anything about them for that matter) so I am using the reservoir off the 855 manual donor.
They are the exact same Volvo 3546956 PN (it just has the clutch feed nipple opened up). I closed up the clutch feed nipple but can see no ball or spring inside of it at all. I am about to bleed the MC and proceed with the swap.
https://photos.app.goo.gl/vCo5oyBtimpKsmrVA







