brake pad wear light after service

[ktlimq]

1992 Mercedes W124.

After replacing front strut and tightening steering wheel at a dealer,

I hear scraping sound when the steering wheel is at extreme position,

and now I see front brake pad wear indicator coming on.


Can brake pad sensor go out of order due to some mistake in such service?

If yes, I want to go to the same dealer for brake pad wear indicator.
If not, I want to go to independent for that.


(I did 15000 mile maintenance about 1.5 month ago. 15000 mile maintenance includes brake pad and disk inspection. The mechanic did not say anything about brake pad or disk except parking brake.)