My 69's rear brakes are locking up. I did a conversion from front drum to disc. I changed all the hoses,line,rear wheel cyclinders, master and proportioning valve. Could i have mixed the lines up somehow or put the valve in wrong so the lines got switched. I thought everything was right but you never know. They brakes release as soon as i get off the pedal any ideas? Thanks guys Ps emer brake is fine

You did put the 'short' shoe of the rear set on the front?