KTM 640 adventure with brembo front brake. I lost all pressure at the lever. After trying conventional bleeding, reverse bleeding, master cylinder rebuild kit and fully dissembling the caliper still nothing at the lever. So I had a word with AJ at Traction in Christchurch. He told me to do the following.
Pump the lever 5 times
Push the caliper in with your knee
Repeat that process 5 times
Then put a bungy on the lever with a little pressure on it overnight.
Guess what? It worked a treat.