Are your rear emer. brake cables good? you might have the cables adjusted too tight holding the shoes off the anchors. Its hard to adjust brakes by using a slight drag methed. The shoes float in there & may be rubbing from being off center. Back off the emer. brake adjustment & adjust all the brakes till you get a heavy drag & back the adjustment off about 4 notches.
Like Mr. Luvr says if you havn't done the master cyl. lately put a kit in it or get a new one. If you have done all that bleeding you coulnt have more air in it unless it is drawing it in somehow.
