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Hi Bruce,
I know you and I have discussed this lack of mention in the literature a few times before, so I will join the fray just to restate, as concisely as I am able, the conclusions I had drawn based on examination of several dead masters in my posession, and some opinions I have of the scope intended by technical publishers.
1. I had not found any rust. Seals were not supple though, and looked as if they had added some of the "glop" found in the disused portion of the cylinder to their outer dimension. The glop was not evenly distributed, so it may have lifted a portion of the un-supple cup seal adjacent to the glop, forming a leak. 240 masters are cheap enough to keep me from attempting a re-seal and clean to test this theory.
2. Though there is a lot of repeating on a forum like this, or info passed without the benefit of personal experience, I still believe we as a group of enthusiasts may be able to come up with some new and useful information not presented in the service literature. The paradox, to me, was not being able to find mention of the same syndrome among enthusiast lists and forums for saab, mg, porsche, and other Euro marques that use similar braking components (i.e. open systems). - Sorry minidave, I had not read your post before writing. - Pressure bleeding is gaining a lot of shadetree support of late. But again, the Brickboard could be the leader in the old-Euro car maintenance arena.
3. I don't expect the publishers of Haynes, Bentley, Clymer, Motor, Chilton, etc. to address all the issues that surface as a result of age and high mileage - these subjects being better covered by enthusiasts and restorers, who have the real experience. Much more to the point, I would never expect Volvo's factory service information to be written based on experience with 20-year old cars; they are written before a model is even released, and TSBs are carefully issued only after legal has OK'd.
So to sum up, I don't really know the root cause of the master's demise after pedal bleeding, but the explanations given seem plausible to me. And, that in my opinion, this syndrome, or a warning about pedal bleeding, is not documented in commercial repair manuals, doesn't detract from its credibility.
--
Art Benstein near Baltimore
Q. What is the only food that doesn't spoil?
A. Honey
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