Have an 10 Silverado WT with the small V8. Noticed at night with the head lights on when I hit the brakes the head lights will dim for a second then return to normal. Didn't think this should be happening on a new truck so I took it in for warranty work. They checked the electrical system and was told it was fine. They said it's normal and it's just the way that the system regulates the voltage. I trust this dealer but I still have a problem believing this is normal. Has anyone else noticed with their truck?