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On 13 May 2005 at 11:34, fess wrote: > When you pump your brakes, or in my case a hydraulic clutch, what does > that do exactly? Look at the shape of the seals in the MC. They allow fluid to flow around the outside edges when you pull the piston back quickly. This puts more fluid on the pressurized side so that you can actually make "progress." It's sort of like an active check valve. The fact that pumping helps does not suggest that there is air there. > question 2. > > does anyone have any data on how much volume can be lost per foot on a > steel braided hydraulic line > vs. a solid hydraulic line? I'm pretty sure that the loss would depend on exactly what kind of line you have. You'd have to get that data from the manufacturer. It's certainly true that a solid line would have less volume expansion than a flex line. OTOH, I think that the pressures here are small enough that the difference would be negligable. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~