People say adjust the star wheel, so brake shoes are totally against drums and then bleed each side with helper in the car. Next back off star wheel so slight drag. I will try this method after M/C bleeding again.
this is correct.
With new shoes on old drums, the curvatures are guaranteed not to match. To see what I mean just lay a shoe in the drum and see how much "rocking action" you get. Earlier I said that this means a small contact window. But not only that, but now, a lot of pedal pressure will force the drum to try to flex into conformity with the shoes. If it succeeds, then the drum will become oval and possibly/probably "bell-mouthed", which can become permanent during use. But the point I want to make, is that with the car stopped , the drum will act like a spring, and make the pedal feel spongy.
Furthermore, with the mismatched curvatures, the only way, on the car, to bring them into conformity, is to use them, which will take a really long time. To speed things up, you want a modest amount of drag, by the star-adjusters.
