GM Brake Controller Fault

BenK wrote:
Am curious, does your brake pedal switch look like the below images?

This is the key to having an after market trailer brake controller
lead the trailer brakes before the TV's brakes ever get turned on


GMBrakeSwitch brakeswitch

These pics for my reference for next discussion on trailer brake controller
and how the GM is different with less than 0.010" travel to turn on
the brake lights

Jframpey wrote:
Hmmm, i recently replaced the brake light switch (on the brake pedal) after getting a cruise control error - After an internet search told me that this was the probable culprit. I have a 08 2500 chevy - I had no issues with the IBC that I know of, but I don't recall towing while I had the issue either.

Changing the brake switch $35 fixed my problems... I took the old brake switch apart after the repair and found it gummed up with grease (someone was overzealous with it during assembly I guess. Anyway I found that the switch had two sets of contacts - one normally open and one normally closed. Check yours out - maybe its the culprit.

Well as luck would have it, left on my trip and ended up having the brake pedal switch go bad.
Was checking my mirrors and saw my trailer brakes smoking along with the drag on my truck.
Turns out the aftermarket controller I hooked up was taking a read from the brake wire thinking I was hitting the brake pedal and activating the trailer brakes.
What a fun ride I had down Rte 13 through Delmarva and all the traffic lights.
I had to hit the brakes but then take my foot and lift my brake pedal to get the controller to release the trailer brakes.
Hats off to Boyd Chevy in Emporia for taking me in with no appointment Monday and putting the new pedal switch in.
Still no parts from GM for the original problem with the ABS Control Module which killed power to my trailer brakes through the factory controller.