John, It sounds like you've installed a leaky mastercylinder. The seals tend to dry out and fail when they are not immersed and swelled up by brake fluid. The symptoms you describe certainly appear to me as a bad MC (& not the rapper/hiphop type).
BenT sent from my electronic leash On May 29, 2011, at 12:07 PM, John Jensen <bluesbug@VERIZON.NET> wrote: > I don't know how to diagnose my brake problem. I changed master > cylinders and bled the brakes already. Anyway the basic symptom is if I > pump them up and push hard the brakes hold pressure. If I ease off on > the pressure the slowly go to the floor. Sometimes if I quickly push > the brake pedal it goes to the floor, but a quick pump will make it hold > the pressure. There are more symptoms but that seems to be the main > one. I don't see any evidence of leaking around the wheel cylinders. > Now fact is I substituted an old master cylinder I had lying around from > parting out van a few years ago. The symptoms from the replacement MC > are more or less the same as with the one I replaced, except the one I > replaced wouldn't hold pressure at all. > Any clues or tutorials from the wise members of this group? > > 1980 Aircooled Westfalia > > John Jensen > johnjensen@johnjensenartist.com > http://www.johnjensenartist.com > bluesbug@verizon.net |
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