Gdonovan you sure are handling the haters on here much better than I would (or have) . It's always a pain when peoples' Mammas dont tuck em in at night then we have to deal with their attitudes. After rereading your OP, with the line lock in the line to the front discs when it's on the pedal is rock solid which tells me that the M/C is good (& it was before) & the rear drum half is good & that the problem is downstream from the line lock which is the front discs. I bet it is the calipers & rebuilt ones are cheap. Keep us updated