On the subject of bleeding brakes, some triumphs seem to be affected with the problem of the brakes slowly getting air into the system so that over time the lever comes back to the bars. Its particularly bad on sprints. Through trial and error I think I have the answer.
The hole in the bottom of the cylinder that feeds into the piston has a slight sharp edge. When you brake suddenly it introduces a bubble effect. I have found that the recommended level of fluid is too low and air gets in.
If you add the fluid to the top of the line as viewed from inside the cylinder ie to the top of the glass from outside, then the problem disappears and the brakes stay sharp and pump free. I think the level marker is a minimum and not an aim point.
Hopes this helps someone. It cured my brakes from gettting spongey.
Nice work on the new Forum