I bled my front and rear XTs today--my first time doing Shimanos and the first for this bike (6 months old). The pads still have life on them but the rear is worn more. Three different guys (2 mechs and one expert rider) said although worn, they still have some life left but they're close. Anyway, after the rear was bled and put back together with wheel on, the lever went to the grip when squeezed. It took a few pumps of it to get firm. Note, it was firm after the bleed with the brake block still in the caliper. I syringed it 2x, tapping the line, tilting the lever, tapping it, etc. Is there air still in there (hard to believe with two, 20 ml fills of oil) or is it just because the pads are so worn that the pistons have to close down a bit before the lever gets firm? Possibly related to that, I did notice that I had to push the pistons back in a bit so I could get the brake block in. Thoughts?