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I just had the same thing happen to my 2017 SDR. This whole riding season was a total waste. Broken radiator, leaking clutch slave, lost the friction material on a front brake pad, then the front brake master.

Thank god this thing wasn't expensive...

 

[Nubicon]

Did you do the work on the master cylinder, or did you have a shop do it? Do you recall part number for MC repair part? My lever slowly "leaks down" as I squeeze and hold it, so I'm pretty sure it's the MC. I'd prefer to buy a rebuild kit vs. a new MC due to the cost.

To be honest I haven't even looked into fixing it yet. I just put the bike back into storage and rode the Harley for the rest of the season. The most progress I made was sticking a post-it note with my KTM dealer's phone number to the dash of my work truck!

Mine will feel great after bleeding it for about 3 or 4 days. Then, sometime after that, the lever goes way too close to the grip. I assume it's sucking air in as there are no apparent fluid leaks.

I will let you know about part numbers or rebuild kits if I get to it before you.