Brake problem HELP!!!

[Flrobinson]

i have a 1996 Yukon on 37s and I have replaced everything in the brakes master cylinder, booster, calipers, braided lines, bleaded the brakes, got the abs bled with a tech2 and I still have to stand on it to slow down. My next idea is to get rid of abs module and install an adjustable preportioning valve any other input would be appreciated

 

[88Scottsdale]

I have recently had this same issue in my 98 Silverado. I ended up still having air in the rear brake lines. It took a while, but eventually after bleeding the brakes a second round it fixed it self out.