Ok simple question but difficult answer.
changing the brake set up. And need to bin one run. The easiest way is to block off one of the outlets on the T piece. You can get solid plugs to close it. But not out here. I could ram a bolt in there. But I would most likely not seal. So shorten bolt so it does not bottom out and put a washer on it so it seals under the cap.
ideally will run a flex the whole way down to the front brake banjo later on. This is just for now.