I have fitted a new rear Frando brake calliper on my project GTS 300 Super sport. I used the existing brake line and simply swapped out the old calliper for the new, torqueing up the mount screws and the brake line nut to the recommended torque settings.
After installing I followed Robot's video to bleed/flush the brake line using a big syringe to vacuum the old fluid through the system. The approach partially worked but seemed to drag a lot of air rather than fluid through when the bleed value was opened. I always made sure the top tank never got too low.
When I closed the bleed valve and screw the cover back on the top tank the brake lever is still very spongy.
I tried another approach where I used the syringe as a bleed reservoir and pumped the brake lever to push the brake fluid through the system. That pushed a lot through to the syringe but didn't fix the spongy feel.
Have I missed something and inadvertently added lots of air top the system?