Q: Spongy brake pedal on 1997 Pontiac Grand Prix

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I purchased the car recently used.I recently changed the pads on all 4 wheels. After changing brake pads, the brake pedal still travels farther than it should, almost to the floor. I bleed the brake lines, with no increase in pedal. There is no visible fluid leakage anywhere. What could be the problem?
(1) Answer
You may have to do an ABS re-set. After brake work on most GM cars, this is a needed step. You need a GM capable ABS scanner to do this. Every time I even bleed or flush brakes on a GM car with ABS, I have to do an ABS re-set beacuse the pedal is very soft and goes to the floor.