New to the forum!! 03 XB9SL with 26k on the clock. I’ve had the bike for 3 months and I just found out from the previous owner that he never bled the brakes since buying it, brand new. He was very diligent in other manners of maintenance. This bike runs like a top, even in this cold weather. I did some DIY maintenance on it today and now am regretting it, unfortunately.

I was bleeding the rear brake earlier today and I believe I seized the master cylinder. I can bottom out the pedal without any fluid coming out when I crack the bleeder valve. Am I most likely correct in assuming I’ve seized it? How should I fix this? Buy the master cylinder rebuild kit? The extent of my DIY experience on autos and bikes is fluid changes. Maybe I should just take my XB to a mechanic... this is a serious bummer.