2000 Concorde LXi

Sounds like your brake switch is out of alignment. There is a fairly easy way to adjust it, I think it involves pulling it out all the way or in all the way, then letting go to self-adjust, but can't remember offhand. It is documented in the factory service manual and should take less than a minute to fix.

Another concern is why it is out of alignment. It could be just random, or it could be a symptom of the brake booster going bad. Has that ever been changed? They accumulate water over time and eventually fail/need replacement.

No, Greg, the booster has never been changed by me and I've had the car from about 25K mile on to the 130K it has now. Those brakes have always been a point of frustration; warped rotors, two bad bearings. The car almost always felt (as it does right now) that it's got a bump on some part of the brake (rotor warped again probably). It's slight, but I'm sensitive to these little issues. Maybe that's why the car is still in such good shape, :-)

I'll have that booster looked at. I scanned the section of of the manual and saw the need for gages so....I 'll have to have it looked at by a mechanic with the proper tools.

Thanks for your help.

To be sure, a brake light switch issue does not mean you have a booster problem. However for me it was an early indication that something was changing and I experienced a brake booster failure during the next cold snap, which was about a month later. (The accumulated water in the booster froze in 15F degree weather).

I would just recalibrate the switch using the very quick FSM procedure but be sensitive to brake booster issues (loss of brake assist, hissing noises, etc.) It's likely nothing will be noticeable anyway until winter, depending on your climate. But an uncalibrated brake switch that leaves your brake lights on can leave you stranded due to an empty battery, plus a reduction in battery life.