I have 93 4WD Explorer XLT.

I recently replaced the front rotors, calipers and wheel
bearings(Parts were cheap and I had some free time).  I then had the
brakes bled and the system aligned at a shop.  Everything seemed to be
working fine until a few weeks later and the ABS system starts
activating under normal driving conditions.  Usually dry level
pavement.  Has become a bit scary b/c vehicle won't stop normally and
heavy pedal pressure and/or a rest period for the brakes is required
for stopping.  When the ABS does not engage the brakes seem to work
fine with no shimmy and sufficient power.

Any help is welcome.  Also returning to the shop is out of the
question as I have since relocated to Colorado from Texas.

Thanks,
J