I see that someone else on the board has an open thread about brake issues right now too, but I didn't want to step on his question. So if you're reading this and like, know stuff about brakes, look around the list a little more and see if you can help the other member, too, please.
Ok, my problem: sometimes (it's happened 2 or 3 times now) while stopped at an intersection or wherever with my foot on the brakes, the pedal -- normally very firm -- will suddenly get a little soft and sink about halfway to the floor. Then it stops, and the brakes hold. But the parking brake warning lamp comes on, which I guess is my CJ's way of saying "yo, brake problem." Pump the pedal even once, and all is back to normal.
It's an 81 CJ-7 with power brakes, and I just had them checked out for my annual state inspection. My mechanic couldn't find anything wrong, no leaks or anything. Since the problem doesn't happen all the time, I don't really know what to try next. Could the power brake booster be failing? Is there any way to check that out for sure before replacing it?
Thanks in advance!