Driver's side brake light doesn't come on after replacing bulb

**IF all other functions ARE working on that light, signal and parking lights,** then it's not wiring or bulb... Suspect the signal light switch...it is part of the multifunction switch... YES, the signal light switch!!... Brake light circuits run through this switch before going to the rear lights, the left (drivers) side ain't making it through, therefore it can't work!!

Make sure the bulb is tight,check wires for loose connections