rear brake lights on 1993 Buick Regal

my left brake lights wont work even though the bulbs are new. the parking lights light up. and the emergency flasher doesnt come on either. only on the left rear side. why?

Asked by for the 1993 Buick Regal
The turn signal switch in the steering column of your 1993 Buick Regal could be at fault here. A couple of quick checks by a qualified technician should should confirm this or point in the direction of the actual fault.