My rear brakes were binding when I took the bike out from a long period of non-use. There was a lot of gunk around the master cylinder and I hadn't changed the fluid in a long time (I know -- shame on me...). so I decided to rebuild the rear master cylinder and the caliper.
After disassembling the rear master cylinder, I noted that there are two holes in the port that leads to the reservoir, one about an eighth of an inch in diameter and one about a sixteenth. The eight inch one is clear and runs to the main cylinder. The smaller one, however, doesn't seem to be open. I tried probing it with a tiny drill bit, but it is definitely not open to the main cylinder.
Shouldn't both holes go to the main passage? I am thinking the the smaller one is the bleed and, if it is blocked, that would answer why the brakes were getting stuck. But I am hesitant to really force my way through it until I know if it should be open.
So my question is -- should both holes in the port leading to the reservoir be open to the main cylinder?
Thanks for the help.