Hello, I recently changed the complete clutch, a nice work. The whole underrun frame had to be removed, but crap. Sometimes you wonder if the manufacturers are even thinking about maintenance and reperaturability. Now to my actual problem. I have to ventilate the clutch. Although the container is above Max., but I would like to change the liquid. What liquid is in there? Hydraulic oil or brake fluid? Sonata 2.0, Bj.2003, 96 KW Greeting Rene