Changed my brakes the other day with Lyndall pads. Everything felt great for two days. The bike sat for 3 days and I backed it out of the garage today and it was making a rubbing noise in the rear. Then when I took off the rear brake feels real spongy and the pedal seems to have a lot of play before the brake engages. I went to gym for a hour or so and when I got back on the bike everything felt fine again. I'm clueless. i would think bleed the brake but why does the spongy feeling go away? Any Ideas?