You know that SVX bladder (not blatter) thing had a dome shape to it? Where as I think all the other brake fluid caps (OBS, Leg) have a flat shape. (The brake caps all look the same form the outside.) Maybe the SVX bladder distorts after awhile? The flat bottom turns into the dome shape after a few years?
For sure when it gets cold out the rubber dome gets stiff (from the cold) and pushes down on the float.
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