Having problems with front brakes locking up... Diagnosis/Solutions?

What is your question?

The front left brake is locking up to the point where smoke comes out with a burning/melting smell. Are there any recalls for this? What exactly is the problem happening? The sleeves have been cleaned and the hose replaced and the galloper is going in easily. Still the problem persists. It is mostly sporadic, happening every 2 weeks or so. Any help for this???