Squeek squeek squeeking down the road on my 07 hensim baja 250 cruiser

I think it's my front brake. This bike is a new 07 which has sat in the garage until just now newly registered.
I assume I should flush out all the old brake fluid and just not sure the best easiest way. It didn't squeak when it was cold, but yesterday on it's first hot long run it started and was instantly scary loud. Water collected over the years by the fluid expanding right, I can't just bleed this thing can I?

I ask such a stupid easy simple question because I had a NIGHTMARE bleeding the brakes before. Read what I thought I should read, thought I knew what I was doing. It took me two damn days to get it right. Different bike, same chinese parts.

Anyone have any tricks of how to accomplish this goal without fighting air bubbles in the lines this time after?

Last time I had to take a power sander and vibrate things and work fluid in and bleed fluid out to get some freak trapped air that didn't want to find it's way out, even that didn't seem to work right away.