Have you replaced pads lately. I had this happen on my 2003 and it was just the overflow from the reservoir being just a tad high. It never happened again. Don't be surprised if your ABS lights start flashing after a hard stop on a cold day. Only a few drops low in that rear reservoir will cause that...and since you lost some...it can happen. Now, if they had not made it such a PITA to refill, it would have been nice.
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735,834 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 84,612 miles (new)
Total BMW miles 497,451
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383