rear brake sticking

[1sttoy]

my left rear brake is stickin. it started doin it after i changed the axle se:happens::happens:al. have tryed to readjust it still did it tryed backin it off all the way and it will still stick. it only sticks when i park over night or after a long drive thought it might have gear oil on the brakes so pulled it back apart cleaned them real good but having the same problem any advice this is my first yota thanks