No brake lights

i guess you checked the bulbs first.did you check the circuit boards for the brake lights?bad to go out on the chevys!do you have power there?

If signal lights work, wiring, sockets and bulbs ain't the problem because the BRAKE LIGHTS use that same circuit, if one works, then the other has got to!.. *IF voltage is going into the brake light switch and is comming out of brake light switch with pedal pushed*... Replace multifunction switch!!! Brake light circuit runs through that switch BEFORE going to rear lights.