Lcfs911 bleeding problem rear caliper

[Slappa]

Hi guys I would appreciate some advice on how to solve the bleeding issue I have on my Lcfs911, the rear brake/caliber don't get hard. Have tried many different techniques, I think that the air is trapped underneath the bottombracket part of the frame.

The picture shows were I think the problem is

[emu26]

Elevate the front wheel while you try to bleed the brakes.  The air will rise to the top.

What brakes are they?