What I know is that the "bubble" finds his way all the way up. I would also suggest to remove the reservoir cup while doing it. I did it many times succesfully with my previuos bikesCan anybody explain the zip tie thing? How does it work?
I used to very sceptical about it until I has rebuilding the Pantah 500. I just couldn't get pressure in the front brake and in desperation I zip tied the front brake lever, left it for a couple of days, and bugger me it worked! I thought this might be a temporary state of affairs surmising that perhaps under pressure the air dissolved in the fluid and would slowly appear again over the next day or so with the pressure released, but it didn't. The brake line remained firm and had no more problems.
So where did the air go? With the lever pulled back it can't get out as there is no path back to the reservoir. I can only assume that the air ends up at the top of the system and when the lever is released it is ejected through the bleed hole back to the reservoir and out. Can anyone offer a better explanation?
A couple of days ago I noticed that the front brake on my Scrambler had gone soft over the winter with the lever coming nearly to the bars. I tied it up overnight and the next day it was as good as always. But I still don't know how