02 excursion bad brakes hit a car!! advice??

[melmount]

the brakes on my wifes excursion took a turn for the weorse. They still work but not all that well. I bled them, each wheel.
at 40 mph i can slam on the brakes it will go all the way down but slowly stop the car not really stop it. I know abs wont skid but these are not working as well as they were or should be. She hit, actually slightly rear ended, a blazer. I have 2,goose egg,dents,in the front bumber.
I bled them and they are still the same. No trouble codes, no abs light. No leaks, not low in fluid. it does not pulsate from warped rotors or pull to the left or right from non working calipers. What could it be? Normally Master cylinder if it has an internal leak will go to the floor then grab the next pump of the pedal etc, or only work if you slam it, and not work if you hit the brakes easy. All feels normal unless you hit them, the truck just slows,
PLEASE HELP