bleeding brakes and getting a burp?

[martin_nj]

Was bleeding my brakes with some Brembo LCF fluid the other night and was getting a burp of air/bubbles in the master reservoir.

I wasn't pumping the level particularly hard or anything but it would puke up a little bit of fluid on to my paint and stuff.

What's going on here? :question:

 

[autoteach]

http://cf.linnbenton.edu/eit/auto/krolicp/upload/master_cylinder.jpg

It is coming out hole C, which is essentially a bleed hole to allow for fluid to fill the cylinder and relieve from the cylinder during normal operation.

 

[Don in Lodi]

Need to keep the lid on the rez, bleed three or four times then refill. On the clutch you'll only get a couple bleeds before a refill. Or go vacuum, need to be careful to keep topped off.
I'm not going to do it again for a while, so I can't prove it, but letting the bike idle for 10 minutes seemed to work all the air out through the top. My clutch was still spongy and the brake was low after a frustrating half hour, let it idle for a bit before going around the block to work out at least the clutch, worked itself out right in the garage.
Oh yeah, mine was after new lines, not with a sealed system bleed.