Brake lights don't work-signal lights do 1989 2500gmc-replaced brake switch on pedal last year-truck sat for winter

sometime it is the turn signal switch that goes out

Your brake pedal controls a switch that turns the brake lights on. If the switch or the wires from the switch are broken, no brake lights.

I can almost 100% guaranty the turn signal switch is the problem. Power for the brake lights starts at the brake switch. power then splits from there and the third brake light gets power directly from the brake switch. Since the turn signal and the brake lights are on the same bulb power for the brake lights is routed through the turn signal switch. the switch depending on what position it is in will allow brake power or turn signal power to there respective left or right brake/turn bulbs.

If you hold your foot on the brake pedal and wiggle the turn signal and or play with the hazard switch the brake lights will almost always intermittently start to work. this will confirm a bad turn signal switch which is pretty common on GM vehicle with this style setup.

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feed supply problem somewhere ?but where ? try checking the wiring loom at the rear or as its called in american "pigs tails"

Most likely this is a brake light switch issue. Replace switch.

If your emergency flashers don't work, all flasher bulbs are fine, but flashing too fast, then check and replace Hazard light switch.

Sounds like you have a faulty turn signal switch.Try this.push and hold brake pedal while pushing on and wiggling the hazard switch and if the brake lights come on then replace the turn signal switch.

You have a faulty turn signal switch.You can check it by pushing down on the brake pedal and holding it while pushing on the hazard switch.If the brake lighs come on then replace the turn signal switch.

OK try this, push and hold brake then push on the hazard switch if brake lights come on then replace the turn signal switch.

well when the brake light's stop working it's because the stop light switch went bad it's right under the brake pedal.

Check the brake light switch should be a orange wire with 12v then a white wire with 12v when the pedal is pressed.If htat cks good then ck the hazard switch by moving it up and down and wiggeling the knob with the brake pedal pressed if they start working then your multifunction switch is bad and needs to be replaced.