Brake warning light on since -20°
I drive a 97 Concorde in perfect mechanical condition, but since the polar vortex hit a few days ago, the brake warning light has been on and so far I can't figure out why.
Things I've checked:
1) Parking brake is fully released. When setting PB, the warning light gets slightly brighter and when releasing it goes back to slightly dimmer, but doesn't turn off. PB fully sets and fully releases.
2) Brake fluid is nearly full. No leaks.
3) Brake fluid level sensor connector is tight, but I couldn't get my hand in the narrow space underneath to unplug and check terminals for corrosion.
The light has gone off a few times but come back on shortly thereafter.
This vehicle does not have ABS so that is not part of the equation. I don't know of anything else that could trigger this light. Am I missing something?