I have a 2001 Toyota Tundra with 25,000 miles.
This winter the brake warning indicator started lighting on the dashboard display when I would apply the brakes. This only occurs when it's cold (below freezing). The indicator is only lit when the brakes are applied, and only when it's cold. When the ambient temperature is above freezing the light will not come on.
The brakes seem to work ok all the time, even when the warning indicator is lit. The brake fluid level in the reservoir is normal.
Any ideas as to what is causing the warning indicator to come on during cold weather, and what I need to do about it?