This may help... this switch has a strange adjustment procedure.
Goto to this website: www.autozone.com
When the page comes up click-on the following links...
Right side of page, click-on: Vehicle Repair Guide
Next page, click-on: 1990
Next page, click-on: Chevrolet
Why Chevy.. there is no procedure for your Olds, but the cars are similar.
Next page, click-on: Lumina-Sedan/Coupe
Next page, click-on: Brakes
Next page, click-on: Brake Light Switch
Next page. There you are, scroll down to the adjustment procedures for 1988-92 Vehicles.
Richard
May 2005