Master cylinder sticking slightly

[1984ranger28]

Hi, after braking the pedal sticks very slightly causing the brakes to drag. I have to put very light pressure on the underside of the pedal to push it up. Nothing seems sticky when pushing on the pedal. It has very smooth motion. What could cause this? Thanks, Lucas.

 

[Uncle Gump]

There is an internal return spring in the master cylinder that pushes the internals back after releasing the pedal. Maybe it's weak broken or degraded. Not sure I've ever had that happen though.

 

[1984ranger28]

I put some oil where the pushrod goes through the fire wall. The pedal still sticks, but it is at a point where the brakes arent engaging.