sorry mate havent been looking here but the back brakes are pressurized by the pump when switcing ign on

so what i did is open the nipples and switch the ign on (with my bleerder hose attached offcourse) and waited until my brakes only gave fluid instead of (old) fluid and air

Dunno about tose tiny bubbles but it might be worth when been driving gently a few days to open the nipples again for a final bleed