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NG900 & OG93 Bulletin Board
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Bench bleed after flushing before connecting pipes
Posted by walt (more from walt) on Thu, 28 Oct 2010 19:48:42
In Reply to: Brake Master Cylinder Rebuild and Brake System Bleeding, George M, Tue, 26 Oct 2010 15:17:32
Didn't know a rebuild kit for ATE M/C used in NG900 was available. Snap ring can be removed with snap ring pliers after drilling two small holes with cobalt drill near snap ring ends. When all is disassembled, you may find inner bore to be rusted and not rebuildable, and you're back where you started. Suggest that you try pressure flushing until all rust is gone. Then run 1/4-inch Tygon from both brake line outlets back to reservoir, fill reservoir, and manually bench bleed slowly until no more bubbles are seen in the tygon lines. You will need to adjust angle of M/C in order to get all air out. To check if M/C was good, after bench bleeding I'd connect two dead ended short brake lines, and see if I could get push back on primary piston and if it would hold. If not, M/C likely is leaking. Otherwise, would connect back to brake system and bleed at wheels with pressure bleeder.

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