You have a binding caliper piston. When you say the calipers were done, what was done?? The pistons on most designs passively release pressure on the pads(rotor)when pressure is removed from the brake pedal (return springs in master cylinder and pedal linkage). If the piston is binding, then I would look for a out of round piston bore or some type of mechanical distortion. If the left front is releasing, then it's probably not the master cylinder or pedal linkage. That left front caliper needs to come out and gone over again..

------------------
Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE