Pretty sure all MkV's had the pad wear sensors.
The circuit looks for continuity within the sensor mounted in the pad. When the pad is worn the disc will remove the end of the sensor and open the circuit. The light will come on the dash to tell you that they are worn. some people will change the pads at this point but i know people who have got another 12 months life out of the pads before changing. This obviously depends upon your driving situation etc and they checked them often to make sure they were still ok.
Just curious why you would change them if they dont need it? are you changing the pad material etc?
hth
1974 1300 Beetle, 1997 Golf GL, 2003 New Beetle Cabrio, 2014 Audi A4 quattro
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