Blazer blues

[PDDET]

I'm the proud original owner of a 1987 S-10 Blazer. Because of my close proximity to my job at the time, I drove her, at the most, 3,000 miles a year.

When I changed jobs, and had to actually start taking her out on the road, things started failing from old age. Even after dropping in a new engine, it's been an ongoing battle.

Now it's the brake indicator. It comes on when I start it up and stays on for the next 20 minutes. Then it goes out. Sometimes just hitting the brakes brings it back. Other times, it comes back with nothing required of me. The brakes feel fine, but I'm concerned that something else might be getting ready to go.

Is this light something I should be concerned about?

If something is on the way out, are parts still available or should I start thinking about cutting my losses?