Q: Q: Master or slave cylinder?

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My clutch pedal has started dropping to the floorboard and sticking. I was thinking master cylinder since the brake fluid is dark and milky. But it is still pumping fluid and holding fluid level. When I crack the bleeder screws it squirts a good stream. I've seen no leaks and I can see the slave cylinder piston move slightly. I already bought the master, but I'm starting to think it's the slave.

My car has 220000 miles.
My car has a manual transmission.

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