i have a 1999 K2500 suburban. The brake lights and flashers are not working but the turn signals are working. i already replaced the flasher/turn signal switch and tail light bulbs. that didn't help. Any ideas on what to do next?

 

Also the fuse and relay in the fuse panel for the stop?flasher are empty spots Where is the fuse?

 

Not sure about your situation, but I had similar problem on my 99 Tahoe. The right brake lamp went out and new bulb did not fix it. I took the lamp apart and found the socket where the bulb fits was corroded. I cleaned it and fixed the problem. Good luck.
David g.