I attempted to syringe out the old brake fluid from the reservoir today and thought I would replace that with some new fluid then bleed the rest out from the calipers in a few days. While I just started syphoning out with the syringe I accidentally pressed synringe in which ofcourse then made little air bubbles in the fluid that's inside the reservoir. This was with the fluid level in the reservoir at above half way. The question is, are these air bubbles just surface level which disappeared or is there a chance one of those bubbles could end up in the system?

 

No harm, no foul! Now suck out as much as possible, and fill w new, then bleed away.

 

They will rise and and break off. Its unlikely they will get into your lines since your system is fully primed with the brake fluid already.