Re: A Tale of Two Patricians

Posted by DavidPackard On 2019/6/13 20:45:45

PackardDon
HH56 beat me to it. I to don't think it is a fluid return to the reservoir. My expectation is the small hole in question is an atmospheric vent between the two seals. It should vent the seal cavity to the reservoir gasket surface, thus segregating the pneumatic seal from the hydraulic seal. I think the intent, as mentioned by HH56, is to keep us from one seal failure from sucking all of the brake fluid out of the reservoir. The cavity itself could be dry or wet ( 'wet' because we over filled the reservoir or a small hydraulic leak), it would still be an atmospheric vent either way.
dp