Losing Clutch Fluid

Morning all, having fitted a 200TDI in my '88 90 this weekend, I have noticed that I am losing clutch fluid. I have checked the master cylinder, pulled back rubber cap on piston shaft and all is dry, no tell tale damp marks on drivers footwell and slave cylinder dry as a bone.
Pipe between master and slave cylinder also seems dry???????
Has anyone got any ideas. Thanks in advance, Vic

same thing happened to me the other week
it was the slave cylinder leaking into the gearbox so there was no taletale signs of a leak a new one is only about eight quid but quite fiddly to fit

shadowster

Cheers, I'll change that and see what happens.