Here I am needing help again. I have a '99 K2500 'Burb w/ 7.4L motor. The brakes are hydraulic boost assisted. I lost my brakes and power steering exiting the freeway the other day. After I got it back under control and slowed, everything came back. I then noticed, with enough pedal pressure, I could put the pedal to the floor; engine running or not. I thought no problem and bought a new master cylinder. No change. Somebody hep me please!