81 gl500 (dual disc dual piston) decided to change brake pads...my obvious thought was to open the m/c and compress the calipers...they wouldn't budge. so i decided to open the bleeders and compress that way...they compressed smoothly. i reinstalled and assembled, pumped the brakes and the calipers came back out as i expected. topped off m/c. now my brakes are dragging. i find it odd the calipers wouldn't back flow to the m/c but the will forward flow to the calipers, and i get the impression they are not fully releasing the discs...do my pads need to wear in for the drag to subside or do i have a bigger problem...i'm trying to repair on a budget...thoughts/help?