Brake System troubles, 1990 CQ

[Richard Hoffman]

Hello all, I have been noticing some odd behavior of the brake light (in the
dash) on my 90 CQ.
Symptoms:
*Light lights up upon cold start-up and stays lit for approximately one
minute.  Once the light goes out, the brakes can be pumped vigorously
without it coming on.
*During moderately spirited driving, it will light up, then extinguish
itself.  It seems to be related to rear suspension travel, as if compressing
the suspension causes the light to come on.
*Situation occurs with ABS on and off.
Known:
*Bomb was replaced one year ago with a NEW (not recharged) OEM unit.
*Brake pads are at about 50%
*Front rotors replaced one year ago
*Rear rotors show a little wear
*Fluid is ATE DOT4, fresh from one year ago
*ABS system is hyperactive.  Likes to engage randomly at parking lot speeds.
  This symptom has persisted for the last 3 years, I have not had it
diagnosed.  I believe this problem to be unrelated, as it matters not
whether the ABS is on or off.  Also ABS operates normally under lock-up
conditions - rain, snow, etc.
*Rear suspension clunks a little.  Needs bushings and mounts, etc.

Looking for some help on this one before the car goes into the shop.  The
only thing I plan on having them do is the diagnosis, unless it is
absolutely necessary (ie: work on the ABS system, which scares me)

Thanks a ton!

Richard
1990 CQ 213K
1970 100LS 46K

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