Make sure the rears are adjusted up good.

When I flushed the system in my truck, my pedal sucked for a couple days.... but, it seemed to 'get better'...... Not sure what that is all about.....

 

Did it suck as in never hitting that "hard" spot.

My pedal got better when I replaced the front calipers on the 44 after a couple days. But I don't think it was this bad...

Not sure what I can really adjust on the rear.... New pads, new calipers, they float on the pins.....

 

The pedal was soft, and low, for a day or three. Now, it isn't too bad. Still not how I would like it, and I will probably play with it some more at some point. But, not today, as it is cold out. Again.