All,
In the coming weeks I plan on replacing the brakes all the way around
on my wifes 1996 Buick Regal. We got this car after the brakes were
replaced and a brake light has been on ever since we got possession, 2
yrs ago, even with a new set of brakes installed by the previous
owner. The person who did the brakes originally had never done an ABS
set of brakes before. I have only done one set of ABS brakes before
myself but I have done more then enough non ABS brakes jobs in my
life. The previous owner is family.

Anyways from my reading I am guessing that they somehow damaged one of
the wheel sensors, and I will confirm this with a reader (autozone?)
before I get started. I am planning on replacing the rotors and all
pads all the way around as this is my wifes car and the car has almost
175,000 miles on it. The previous owner did a 150 mile daily commute
by expressway. The car runs good but that many miles starts to make me
think how much should I invest in this thing.

So my question are as follows;

Is the wheel sensor the most likely cause of this light?

(My wife and I are both college students and also I am cheap by
nature) :)

As these sensors seems very $$$, is there a quick way to test these
sensors if I was in a junkyard situation looking for one? Can I get
one from a yard?

Also is there any tidbits of information I should know about this car
or ABS brakes before I get started.

Thanks,
Chris