200 rear caliper problem

[Peter Schulz <schulz@ed.ray.com>]

Folks:

Need a bit of help/advice.  I finally found why the brakes on the TQW
felt mushy..the rear brakes were not operating, due to the emergency
brake cam not releasing.  I sprayed the spring and cam on the calipers 
liberally with WD40, and the passenger rear seams to be working now,

However the driver's rear caliper is still sticking, even after WD40
and forced operation of the cam.  The good news is that the e-brake
lever, which once could be raised to the upper limit, now has less than
two inches of travel, and I don't appear to have a rusted emergency
brake.

I searched the qlist archives but could not find any tips on dealing 
with this problem, and bentley does not appear to go into any detail
in rebuiding the rear calipers on this issue, only covering piston and
seal replacement.

Could someone explain how the emergency brake closes the caliper, so
that
I have a better understanding of what is causing the binding, an whether
the caliper can be rebuilt or whether I should spring for a rebuilt
one...

TIA!

-Peter Schulz
1991 200 TQW
1990 CQ
schulz@res.ray.com