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This is going to be a hydrolic problem. Either the system has air in it, the master cylinder is bypassing, or the slave cylinder is hanging up. I have also seen the throw out bearing cut its way through the fingers on the clutch pressure plate, but you would be getting a roaring sound from the clutch. With the fluid in the clutch master cylinder being black, you will need to replace both the master and slave cylinder. Now for the bad news. The slave cylinder is inside the bell housing so you will have to pull the trans out to replace it. With this being the case, it would also be a good idea to replace the clutch while the trans is out so you do not have to do it latter.
You are very welcome.