I'm Neal and I am here to assist you. Only accept when you are happy with my assistance. If I can't help I will open your Question to other experts.
That sounds like you had a master cylinder going bad and resetting the calipers finished it off. Not an unusual occurance. The pads being thin will not make the pedal soft, that had to have been the master cylinder.
Wednesday, May 16, 2012 9:35 PM EST