Yep, it's toast. Refresh the whole system once right and you won't have to think about it for quite awhile.
Nope, the diaphragm should fit into the recess on the top of the reservoir. Once the plastic plate and cap are on you should not see it.So the fact that the top of the gasket is bigger than the master is okay?
my 1200 has dot 3 only stamped on the lid, would it be better to use a dot 4 fluid:?Where did the clutch brake fluid (DOT 4) go?:?
Most of the time that diaphragm just needs pressed back into shape like Ken said. I'd run a lot of brake fluid through the system if the diaphragm truly is misshapen due to contact with some caustic chemical.
Now there's a mystery.my 1200 has dot 3 only stamped on the lid, would it be better to use a dot 4 fluid
My 87 GL1200 says DOT 4. Maybe PO put a different lid on? I ended up not only flushing the system but rebuilt MC & SC. Pay attention to the smaller hole that has the metal shield thing stuck on top. Mine was plugged solid with some kind of aluminium corrosion and had to be cleaned out (I used welding tip cleaner wires). Otherwise, the fluid won't return to MC and eventually into the ride the clutch has built up pressure (you will have zero play at the lever when there should be a little) and the clutch will slip, badly. I have been through the clutch hydraulics from one end to another, brakes too.my 1200 has dot 3 only stamped on the lid, would it be better to use a dot 4 fluid