Clutch peddal sticking down and loss of Fluid

[Juice14]

So ive seen some members have had problems with the cluth, slave cylinder, lines getting hot, etc. My problem is a little dofferent and I wanted your imput.

to meke a long story short, My clutch peddal is sticking down, as I check the reservoir, its completly empty. I tried bleeding the lines and it started to work and the peddad started to rais and feel more firm, but couple seconds latter went down again. Now the reservoir had fluid in it but the clutch is sticking down.

My mechanig will take a look at the whole system today to see if there is a leak or what it could be.

Ive been looking around for slave cylinders and only found the ZSC slave cylinder.

what could this be? slave cylinder? master cylinder??? Im guessing its not the clutch return spring...

oh and by the way it doesnt make sense why Nissan would locate this inside the case where it just gets a bunch of heat, not to mention its a part that seems to be moslty plastic.

thanks for your input...