Quote:
Originally Posted by particlewave
A couple months ago, I took the car out for a drive and had significantly reduced stopping power (pads are relatively new). I flushed the brakes and that helped a little, but not much.
The booster appears to be ok and it is getting 18” of vacuum (the pedal is not hard and it passed the “hold pedal and start car” test).
My only thought is a stuck caliper. Earlier this summer, the car did get put away wet and the rotors rusted a bit and froze to the pads...
Any other thoughts would be greatly appreciated! 
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your rubber? lines between the hard line and the calipers can have issues.
They can swell inside and cause problems with the brakes releasing acting like a stuck caliper.
Or they can soften causing them to swell when you apply the brakes thus less clamping force at the caliper.

From you description:
You may possibly have the second problem.