Calipers Sticking on Rotors!! Help

Well, got the prob taken care of.:banghead:

After putting the NAPA calipers on it, it drove fine for about 2 miles then got tight again.
I was headed to class yesterday and got about 2 miles down the road and they tightened up again. So, I turned around and headed back home.

Got about 1/4mi from home and just thought about what Trailbeast posted about maybe the pedal is sticking or something so I just happened to put my foot under the pedal and pull up.....sure enough it popped up about 1/4" and all was fine:violent1:

So to recount yesterday, I had to call off work, swapped calipers, and all it was, was the stupid master cylinder had a sticky spot in it.

Drove it all day today and last night with no probs.:cheers:
Thanks everyone who offered suggestions!