Ok, I'm pulling my hair out and don't have any to spare! I have a 97 Silverado 1500, Ext. cab, 5.7, etc. I now have a problem with my flashers: they work fine (left, right, and hazards), UNTIL I press the brake pedal. When I press the brake, I hear something (I assume a relay) buzz for about 1/2 a second and then flashing stops and all brake/marker lights are on solid (front and rear). I've replaced the flasher relay (under hood), the brake light switch, and finally the flasher arm assembly (in the steering column). I'm at a loss for what to do next! Any help is much appreciated!