Today I bleed my brakes for the first time. The old fluid was a dark brown and I would loose braking power after a few hard stops. The pedal before the bleed was always a little low and it seemed that I should have a bit more braking power. There was about a 1.5" dead zone that did nothing. After the bleed I no longer have a problem with losing the brakes, but they still feel a bit spongy and have the dead zone. I have to press extremely hard to brake compared to all of the other cars I've driven. All of the brake pads are good and I bled until I had new fluid with no air bubbles. Any ideas on how to improve the brakes and eliminate the dead zone?