1999 Mazda Miata hydraulic clutch fluid leaks out. Must I replace clutch or how can I determine problem?

Stopped at traffic light and was not able to shift to first gear. Clutch goes to floor. Checked fluid level and practically empty. Added more which ran out. Hope I won't have to replace clutch. Would like information before going to garage as I don't know a reputable mechanic in the area.1999 Mazda Miata hydraulic clutch fluid leaks out. Must I replace clutch or how can I determine problem?
It is most likely the slave.

I say this for two reasons-

1. It will work when refilled for a while (it pumps up).

2. That is the part that went bad on my Miata.1999 Mazda Miata hydraulic clutch fluid leaks out. Must I replace clutch or how can I determine problem?
I would replace both the master and slave cylinder. That way you are sure to eliminate the problem. Usually when one goes the other isn't to far behind. And another suggestion I would go the the mazda dealer and get the parts. They are brand new as opposed to the reman parts you get at the local chain stores. Yes they will cost more up front, but they will give you the performance of a new part. Instead of relying on someone whose name you can't pronounce to rebuild the part correctly.1999 Mazda Miata hydraulic clutch fluid leaks out. Must I replace clutch or how can I determine problem?
If you replaced the slave previously and you checked the master cylinder....then you might want to check the hoses that feed both. You could very well have a cracked hose that is the problem and letting the fluid leak out.
you probably need to replace the master cylinder (if leaking from top of system) or slave cylinder (if leaking from bottom)

jdm