Brake Light?

[Robert Deis]

1986 5ktqw, the multi-complaint system is giving me a "brake" warning
intermittently.  Pentosin and brake fluid levels are both good, and I've
detected no problems with brake operation.

Pumping the brake pedal after shutting the car off, I find it very
difficult to detect that the power assist has gone away, so I'm not sure
how many pumps it takes..  Operation when I'm driving is fine.

Most often, the brake warning comes on shortly after startup and goes away
after a few seconds, but it seems to randomly appear at other times as
well.

What's the deal, masters? 

-- 
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  Rob Deis                  "Let the people know beforehand what the law
  MiB3347                      is and what they are to expect." 
  rdeis at io.com                              -- 18th Congress, Rec. 75