is this the type where you push pipe in one click and fluid comes out of a open stub then you click in again to close the port
we have had success by running pipe up from stub up to master cylinder resevoir and leaving to bleed itself for a while while doing other work up to an hour
when fluid stops rising in pipe press pedal to floor and click pipe to second position
this works for us most of time
the odd one we have to use pressure bleeder with low pressure HTH