2000 Laredo Brakes Hop, Won't Go Away

I've had fits with this thing. 2 new caliper assemblies 3 disks either replaced or turned and it still hops like crazy when I put on the brakes. Also if I bury them the ABS doesn't seem to work but it still hops like a rotor a half inch out of true. I did change out all the fluid which was rather nasty along the way. Is there anything like the ABS possibly malfunctioning that would cause this sever brake hop? No idiot light is showing. I'm stumped.....................:crying: