Hi.
I needed to rebuild both rear calipers on my S5 Turbo Convertible. That has been done and we reinstalled everything today.

We bleed the rear brakes using a bleeding kit using both bleeding screws. --> Both calipers worked but there was no brake pressure.
So we bleed all 4 brakes, maybe some air wandered. Let it run on each caliper till there was clearly new brake fluid coming out. --> Better, but the brake still feels like there is air in the system. Brake does not engage for 80% of the brake pedals way.

I suspect there are still air pockets in the rebuild calipers. Any trick to get all of the air out?

 

No trick, but it's time consuming. The sequence is starting from the wheel furthest from the MC and working your way back toward the MC, i.e., RR, LR, RF, LF. I usually do a 1-man bleeding job using a MityVac handheld vacuum bleeder. If calipers were taken off or brake lines were open, than it might take me 5-10 times total per caliper.