[urq] Leaky Proportioning Valve

[Eric Renneisen]

OK, a friend of mine had a used S4 G60 caliper and no need to hold any
really heavy doors open, so I replaced my nasty seized rebuilt one with
it.  As part of the process, I pressure bled the entire system, starting
with the MC and proportioning valve, and even the clutch slave (nasty
stuff came out of there!).

A quick test drive confirmed that the new caliper completely cured the
vibration under braking.  When I came back to the car a few days later,
I found a nice puddle of Ate Super Blue and a low reservoir.  The only
positive from this is that the epoxy floor made cleanup a snap.

The source appears to be the proportioning valve, probably the round
area next to the canister in the inset picture here:
http://img.eautopartscatalog.com/live/N306021813ATE.JPG
Anything to be done about this besides replacing the whole unit?

Eric Renneisen
'94 S4
'90 CQ 20V
'86 urq
Chattanooga, TN