I've got the same problem and have been living with it for a whilst.
1st i changed the slave for a new one.
Then i changed the rubber hose to the slave for a stronger one as the original felt soft.
Then i replaced the master, the rod was slightly bent, it helped a little and the pedal doesnt get stuck on the floor anymore but the pedal is still very light.
I guess the new master is the problem.
I bought the Master from Vagparts so i got no recourse i guess.
1st i changed the slave for a new one.
Then i changed the rubber hose to the slave for a stronger one as the original felt soft.
Then i replaced the master, the rod was slightly bent, it helped a little and the pedal doesnt get stuck on the floor anymore but the pedal is still very light.
I guess the new master is the problem.
I bought the Master from Vagparts so i got no recourse i guess.
The second time the garage found a weeping pipe, replaced it and the master cylinder lasted alot longer! However, just had failure #3 last month... master cylinder was tested and yup it was knackered 



Horrible. I just need to stick to my recovery plan rigidly and I should start to make progress. Finger crossed.
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