1997, S 90, the rear ashtray removed, carefully pry up the plastic trim to expose the adjuster nut. You will need an open end wrench, 10mm I think. a few easy turns (as much as needed) .will get the emergency brake lever to tighten. Fun the first time, you will be an expert on the second.

Len

Thanks guys, this is exactly the same fix for my 1997 S90 which I just finished.
Len