I have a 99 3500 cummins 2wd, just had the front and rear brakes done including rotors, a new ball joint and an alignment, when we hit the brakes at about 30 mph or more the whole truck just shakes like its going over some major washboard, dont thinks its the abs, disconnected it still the same, any ideas?

 

Have you installed new tires lately? Since I installed buckshots on my truck my truck has done the same thing, no idea why.