I had two calipers leak some fluid from the bleeder screw during a track day (white residue trail down the caliper from the screw). Given that the pedal stayed solid, we concluded that some residual brake fluid sitting in the bleeder nipple boiled off (the opening is upward so it can hold a few mls).
It sounds like you boiled your fluid. Either you had some fluid in the bleeder screw top that also boiled off, or your bleeder screws need a little tightening. A 10mm wrench makes it an easy job, but you'll have to pull the wheel to get at the inside bleeder screw (two on each caliper).
If the pedal is spongy, you'll still need to bleed your brakes though.
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2013 Cadillac V-Wagon, RIP Z
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