Am working on this same problem on my 400E
What I thought was a bad caliper turned out
to be parking brake shoe sticking....Anyway,
I have replaced both sets of shoes and springs
on both sides BUT now the driver side rear
will not rotate freely. Looks like the "retractor"
on that side will not "release" fully keeping the
shoes apart (i.e. rubbing the rotor). I have
tried to adjust the cable but no luck yet.
I squirted some wd40 into the hole from where
the cable enters the wheel area...maybe there is some rust preventing from letting go completely.
Those parking brake shoe springs are a PITA to put on!
Anybody have any ideas on what else I should be looking at?
92 400E 128K
99 GMC YUKON 88K