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Removing the wire from the proportioning valve only confirms if it is an imbalance issue or a parking brake switch issue, no use chasing an imbalance issue if it is a parking brake switch issue. If the light goes out which I believe it will just tells one where to go next............. The VERY...

Also unless the 1988 M998 has had its parking brake updated then it has nothing to do with the rear calipers as the parking brake is on the back of the transfer case. And if it has been updated (parking brake cables to the rear calipers) then you would need to drive back and forth several times...

The light is NOT only associated with the parking brake, it is also connected to the proportioning valve by the master cylinder, the fact that it goes out when the brakes are pumped would seem to indicate an imbalance (possibly air) in the brake lines. it is simple enough to check, just unplug...

Probably not if it had been bleed correctly, of course flushing the system with DOT 5 should be a priority. If it were me I would flush it thoroughly drive it a while and flush it again, not going to be cheap, was a big mistake.

For now ignore the "hissing" unless you have fluid out of containment (leaks) You should bleed the brakes and see if that helps the light issue, was it low on brake fluid? BTW do not get too carried away on the pumping the brakes cuz you could hasten the demise of the seal in the hydo-boost...