My FA50 has been having front brake issues where the brake won't disengage entirely once fully applied. This issue has caused a 5 mph loss and abysmal acceleration once applied, otherwise if I reach down and force the lever to move back it sit at the correct position until applied.
I believe this can be two issues:
1) A weak shoe spring. I replaced the front and rear drums a few months ago and replaced the rear drums with the original springs and the front brake with new springs (The supplier only sent 1 at the time).
It makes sense to me that the springs cause the drums to even out, and if it were weak, would cause them to stick out and rub against the drum.
2) The lever is full of gunk and can't move properly. I think this would be less likely as the lever still operates somewhat. In the photo below is what I believe needs to be reassembled.
Any advice would be appreciated, though I hope it isn't the shoe spring as I thought the spring would last as long as the brake pads.