Hello, I have a 2002 A4 Quattro and I am having a clutch issue. I was pulling up to a stop light and pushed the clutch in to put it in natural to coast up to the light. The light turned green, I pushed in the clutch, slight pressure at first then the pedal went to the floor and came back up but I couldn't put it in gear. I had it towed home and replaced the master and slave cylinders and bled the system 3 ways (gravity, suction and pressure). Still won't disengage the clutch. Any ideas on what to check next?

The clutch was solid before this and never slipped. There was no noise when it went out and the pedal came right back up.