Pull the wheels off and see if you can push the pistons in... use a big
pair of pilers or similar between the top of the pad and the caliper. If
you can't move them, they're seized. If they move with great effort, the
hoses are plugged up. You can crack open the bleed screw while applying
pressure to confirm this. If fluid shoots out and the piston moves, the
hoses are the restriction. (But beware that you're introducing air into
the system by doing so.)
With a car that old, you're pretty much guaranteed to need to replace
something... hoses at a minimum. Old ones will definitely cause the
symptoms you're describing.
I'd start with checking all four calipers as I described, then replacing
the hoses. If you find a stuck caliper, its best to replace them in pairs.
The brakes on a W116 should be quite excellent with good pedal free. New
hoses are a big part of this feel.
Jaime
\
The problem is Jaime, that Allan already replace all the hoses. See
his 3:15 post:
"Additionally all the rubber lines at the calipers are new. Calipers
themselves are of unknown age."
So that leaves us with calipers or Master, but it sounds like the master is ok.
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