1981 Chevy Camaro lighting issues

Electrical problem
1981 Chevy Camaro V8 Two Wheel Drive Manual

when I push the brake pedal, all the dash lights and the front parking lamps come on also. I have checked all the bulbs, all are the proper dual filament bulbs that are not burnt out. The car has a new headlight switch and a new brake light switch. I noticed when installing the brake light switch that this happened even when only the power wire harness of the switch was plugged in. So best I can figure, the switch is pushing the power back up through the taillight line when the brakes are pushed. I've checked all the fuses and am out of ideas. Everything I can find online says to check the bulbs, but all is well with them, like I said.