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I've got an87 pu. The cap on the MC has a float sensor which turns the dash light on when fluid is low. Also I don't know for sure but what about the parking brake. Is there possibly a switch that turns the light on when handle is pulled. I know other vehicles have this.
I think the point canuck is trying to make is that the E-brake and your fluid sensor both share the same warning light indicator. I have the same problem and after replacing pretty much the entire brake system the light still flickers every once in awhile. I wasn't chasing the intermittent light problem by replacing everything. The parts needed to go anyway. The point is, my warning light flashed occasionally before and after everything was replaced. I chalked it up to a loose wire in the instrument panel.

Check the float sensor on the MC reservior and the E-brake indicator. If those are fine then it's most likely in the wiring harness or instrument based problem.

PS. The Valvoline Synthetic brake fluid is awesome and is compatible with DOT 3 and DOT 4 fluids. That's what I run in everything.

'86 Toyo 4wd
'04 600RR