Clutch Problem

I have a 1987 Mazda B2600 4 cyl. 4x4. It has 204000 miles. Recently I have been losing clutch (brake) fluid rapidly. I found that the Slave Cylinder was failing so I replaced it, but am still losing fluid. I have checked the Slave Cylinder and it doesn't seem like there is any leaking at the hose connect. I don't see where else it could be leaking. Does the fluid go anywhere else besides the Slave Cylinder from where you add fluid under the hood? Please help, I'm adding fluid each time I drive somewhere.