if youre replacing it, buy the master cylinder and slave $150 at the dealer, will fix it up, these dont last forever
my mates have rebuilt the master cylinders before, but I dont have those kind of tools lol
its a leak in your master clinder (check under the dash near the clutch pedal, at the firewall connection you'll see fluid gathered there at the cylinder)
just top it up with oem brake fluid and keep an eye on it, get this fixed as soon as you can
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