brake help

I agree with the hose idea. Crack the bleeder at the stuck caliper,when it is stuck. If it bursts out with any kind of force, that's a tell.
Adjusting your rear brakes tighter(assuming they are loose) will force fluid to return to the master, pushing the piston assy towards the pedal, and help to park it.

Do you have a brake booster?
There is a spring in there to return the diaphragm, which is connected to the pushrod, which is connected to the pedal.Short of a bad hose,maladjusted rears, or a mechanical pedal problem, I might look here.