Most GM brake light switches are held in the hole by a steel clip that grabs on the plastic threads. To remove the switch, you just grab the switch and pull it out. Requires a little effort. When you replace the switch, it pushes back into the clip fairly easily as the clip has one way tabs. You push the switch in until it bottoms out on the brake pedal arm. The threads are just there for the clip to grab onto. In rare cases where the clip fails to retain the switch, I have had to screw a nut onto the back side of the switch to prevent it from backing out of the clip. This is the case sometimes when you are reinstalling the same clip. Otherwise a new one will generally hold because of the new plastic threads.
SOURCE: Brake Light Switch clip on 94 GMC Pickup
My 1996 Brake light clip needed to spread open with a screw driver(some what like a round spring) and with another screw driver push the switch up the pin. The switch will push the clip off the Pin. The pin has a head that needs to clear clip while the spring clip is spread open. It took me a while to figure out.
SOURCE: gmc yukon has the abs & parking brake light
you have to fix the problem with ur brakes- first check the wiring ,connectors and connection clips to the abs sensors and modulator if looks ok than have truck scanned some auto stores such as auto zone / advanced auto do it for free the code will give u a start point towards fixing ur problem--visual inspection of brakes doesnt always show problem
SOURCE: 2004 GMC Yukon xl......If I put left turn signal
That vehicle has all three switches attached to the same module. Spray a little wd-40 into the flasher switch. Sometimes the slide on the flasher switch gets a little sticky and won't allow the turn signal to work independently. If that isn't the case, there is a repair kit for that available on ebay. the module of course costs around three hundred to replace but could possibly be found at a boneyard for much less. Also, check ebay for that module. Hopefully the WD-40 will fix it. Good luck.
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