Lots of good information here, one thing I would ask you is where were you buying these sensors from that so many of them were bad??
Did you keep going back to the same place? After the first bad one - I probably would have returned it & went somewhere else.
I have had such good luck with their parts.
I had to swap out a motor in my truck a
few years back and used all AutoZone parts.
I have also done a complete brake overhaul
and they have never been better. Used their
highest end DuraLast
There are no Napa's close by and AutoZone
is just down the street and another one just
a few miles down from there.
I had to go to a neighboring town for a small
for a small job and stopped at their Autozone
and they had the good one.
I have done countless hour of research on this
and a lot of times people don't cure their issues
with the easy sensor replacement. And they never
return to tell what the issue really was. Some
have mentioned getting a bad one. Nothing
worse than having to do a job twice because
of a faulty new part. So meter them.
I metered the old rear and it failed. After removing
it I metered it again and it showed good. Changed
it anyways. I should probably change the right rear
so they are all new.