164 "Brake" & "Pad Wear" lights flashing

[Antonio Riso <Riso@domain.elided>]

I have recently tried (unsuccessfully) to replace the O2 sensor in my 164.  In 
disconnecting
and reconnecting the wires to the sensor, I reached through the opening in the 
wheel arch above the
steering box, thus moving a lot of cables and wires in that area.
Shortly after I put everything together, the "Brake" & "Pad Wear" light would 
go on and off together
while driving the car.  It seems as if I disturbed some connection while 
working on the O2 sensor.
I'll be replacing the front pads soon, but somehow I don't think that's the 
problem.  Can anyone
explain how the circuit works and how to diagnose the problem.
Any help would be appreciated.

Antonio Riso
1991 164L auto
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