I rebuilt the engine, put it all back together and the brake fluid is now going low. I know the clutch uses the reservoir, am I missing something? Seems like there is a small leak under the car also.

 

get under and look/feel for whats wet then?

 

Seems like its coming from where the tranny and engine mate together

 

I couldn't find the tread but I remember reading something is supposed to be replaced everytime when the tranny and engine are seperated?

 

possible slave cylinder?

 

Sounds like your slave cylinder is leaking.

Whenever you take the transmission out, it is a good idea to replace the slave cylinder if it hasn't been replaced recently.

And yes, the clutch slave does share the same reservior as the brake system, so if the reservior goes low its probably the slave cylinder leaking.

 

It could also be the fluid line connection inside the clutch housing at the top bleeder.