I finally got the Greenie to a Guzzi club gathering, this one was a lunch in Cougar, Washington in the shadow of Mt. St. Helens. Great roads out there and a lovely lunch at Lone Fir Resort.
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If the seal was causing a problem typically they leak when they get old. I guess I should reread all 70 pages as to why you think it's the seal.
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Here in the States they highly recommend a peek at 50 yrs old. I had mine a year early so I'm good for a while. I asked for a copy the video and they said they don't record it. Right...
As noted the current rear master is way too small for two calipers. You may need to go to a vintage rear master (Ducati 900SS Bevel) to find one big enough? I need to go to the gallery to see what brakes you're actually using now.