If you're not losing any fluid it could be the 2nd seal (rubber) on the master clutch has failed, had that happened to me once on my e36 320i, removed the cover by the pedals, loosened or unclipped the master clutch pin from the clutch pedal, then I pulled the rubber (dust cover) from the master clutch, used a circlip pliers to remove the circlip, then had a small container and old towels handy and kept it under the master, pulled out the piston and saw the 2nd had failed, visually and physically inspected the master for any pitting (yes I fingered my master, but only to make sure it's not worn out [FACE WITH TEARS OF JOY]) bought a R45- R50 master cyl kit, fitted all the new rubbers and carefully reinserted the piston with new rubbers that I dipped in fresh brake fluid, had a syringe and squirter some brake fluid into the master before inserting the piston, it lessens the bleeding time on the slave cylinder (made sure the rubbers weren't pinching on the cylinder wall, if that happens and you force it in the rubbers will break) once the piston went in, with fluid already in the master I immediately felt resistance on the pedal, on the test pushing it with my hand then I just reversed the removal to put everything back, bear in mind we were 2 guys when it came to the bleeding, he was pumping and I was underneath the car to open the bleeding screw, bled it till there was no more air coming out just brake fluid and the pedal was back to its original place. If it's not your master,slave or leaking any fluid I'm afraid your pressure plate has collapsed.
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Tools I used after the cover was removed was an 'L' shaped circlip pliers, a thin flat screwdriver, small plastic container (margarine tub works) to catch the brake fluid and old towels under the tub for insurance and the syringe
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