Why is my brake pedal so high ?!

I did a disc brake change from drum and had the same problem. My resolve was that I had bent the brake light switch bracket back about an inch and this was allowing the switch end to miss the peddle assembly. My brake lights were staying on as well and thats what led me to the switch assembly.
After bending it back a little my problem was solved. Lights off and peddle equal to the clutch peddle.