Hello, sorry if this is not through right place for this. Im new to this so please move into correct place. Im having a problem identifying a part I need. Basically it started when my 2003 Audi a3 desiel clutch pedal became very soft and then eventually went completely. Bleed the system and it worked again but got worse over time. Took it to mechanic and he pulled a part out which he called the clutch master valve and said it was leaking letting air into the system. Please see attach below the pictures. I cannot find the part anywhere. And I am not sure it is what the mechanic called it. Any help would be appreciated. on the second picture its number 20. dealship says i cannot buy just that part but i have to buy the whole unit which is over a 100 pounds. does anyone know what it is called and perhaps where i could find it.

Thank you very much

 

Moved this to the A3 section for you. Should be able to get the help you need in here