ABS concerns

Hiya again folks

95 Z71 w/ front discs and ABS system acting strange

symptoms started a while back ,,brakes seemed to be working aka: I could stop ,but sometimes when I would hit brakes I would hear (and feel) the ABS engaging

I had a rear wheel bearing seeping some grease ,,thinking that might be causing ABS to engage since rear brakes might be sticking I change both side ,,still had problem

changed pads and 1 rotor on front ,,keeping check on fluid as I bled cylinders back and repumped brakes

but problem still there ,,I am not using the brakes hard ,,nor does truck seem to be pulling in any certain direction when braking


am stumped ,,any ideas ?

thanks