i had a simular type of problem with a 1996 model once that had sat in the garage for a few years and it turned out to be the front flexible hoses had perished and in effect closed the inner pipe hole to next to nothing, so the pedal felt right but the calipers were not moving far and the brakes were not working fully, once i had replaced them all was good .now i'm not saying this is the problem but might be worth a look.