I don't. Read what I said. And the issue with people's brake lights being on is because the lights tend to be more sensitive than the brakes themselves. It's quite possible to trigger the brake lights on many (most? maybe even all?) cars without pushing the brake pedal hard enough to deactivate the cruise control.
The cruise control deactivation is tied into the brake switch. If you push the pedal hard enough for the brake lights to come on, then the cruise is deactivated as well.
You've tested this? I'm not discounting that this may be true on *some* cars. But while I'd assume the brake lights are tied to the switch itself (for safety reasons), I'd expect the cruise control logic is more computer controlled and may have additional requirements (pedal pressed farther in, for longer, etc). You can accidentally bump the pedal and your brake lights will flash on. I don't think that will deactivate the cruise control though. At least not on newer cars.
I'll test this when I get a chance.
Edited, Aug 1st 2012 4:11pm by gbaji
If I even tap my break pedal with the cruise control on, the CC shuts off. This is on an 04 Grand Prix. Not a new car, but not an old clunker, either.
Same with my '05 Chrysler Town and Country. I even tested it out on the way home from work today, if I push on the brake enough to make the pedal move, the cruise is disabled until I press the Resume/Accel button. Same on the Ford Taurus sitting in my drive (I forget what year that one is). Gbaji's just spouting more "obvious facts" to try and support his point of view.
For safety purposes, I would imagine that the disabling of cruise control would be priority as soon as braking was detected. Unless of course you are driving a Toyota.
Recently my brake light switch failed. With it my cruise control deactivation, and my ability to remove my car from "P" unless I pushed down the little button. All 3 systems were restored with the replacement of the brake light switch.