I would be highly skeptical if the Valenti lights were the problem, the DRL & turn signals function perfectly fine, I installed them myself on the car about a year ago. Never had any issues, soldered wires together & didn't use t-taps to connect them, I actually checked this first thinking I might have a short or something not the case. This occurred at a high speed 60-70 mph roughly when transferring from rough asphalt to a lowered smoother concrete gap between the twosection of asphalt road.
http://www.ft86club.com/forums/showthread.php?t=11509
I have been going through this thread as well I found a lot of good info there. I've narrowed it down to be more than likely one of these three things.
1) break sensor busted
2) wheel speed sensor busted
3) or what I'm leaning towards as a very real possibility is that the crack/gap whatever you want to call it, where the two pieces of the road are merged by the concrete slab managed to disrupt the steering angle sensor when I drove over it ( wheels are no longer aligned properly ) ?
Didn't get the chance to have someone watch the back of my car while I was adjusted the thing under the petal to see if it would fix the issue, so I decided I'd just go out to my car on my half & see if I couldn't get it back in order myself. I pulled the switch away from the petal toward me about & locked/tested about three different times but saw no results of it fixing the break light.
Not sure if I simply didn't pull it far enough, pulled it to far or somewhere in between is actual the sweet spot. But I could imagine it would be sooo much easier to adjust it notch by notch with someone waiting for the light to appear. I'm thinking I'll just bring it to the Toyota dealership tomorrow, have my girl bake them up some goodies before hand and see if I can't get it covered under warranty ! But once again I want to thank you all who have posted I am pleased to have such an awesome community on this forum !