This problem just came up today while I was driving. I checked the brake fluid level, and it was fine. The two-wire connections on the filler cap also seem normal. There are no noticeable braking issues while driving. Interestingly, when I pull up the parking brake handle, the dashboard brake light gets a bit brighter, and when I release it, the light dims slightly.
Has anyone else encountered this issue with their car? What was your solution?