GMC SONOMA BRAKE LIGHT NOT WORKING

All Three Of My Brake Lights Do Not Work. I Have Replaced The Bulbs In The Tail Lights With No Luck. Suggestions?

Drivers Side Brake Light Doesn't Work, Blinker Flashes Fast. All Bulbs And Fuses Are Good No Loose Ground Wires And Flashers Work...

I Have Power Going In And Coming Out Of The Pedal Switch. I Have Turn Signals But No Brake Lights. I Unplugged The Harness Under The Hood...