Hi crazy froggy,

the next time you bleed your brake system, try to bleed it from the bottom.

That means, you by a little oil pump, fill it with brake fluid, connect the outlet from the pump with a hose and connect it to the bleed nipple. Open the bleed nipple a little bit and start to pump the brake fluid into your brake system. The result is, you have no air in the brake system. It makes even more sense if you have a braided brake line to do it this way.

kind regards
friedo

Thanks for the tip Friedo, I'll try the oil pump trick, had a look at your site and was glad to see that a piston is a piston in English
Wilfrid