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09-08-2020, 01:34 PM | #21 |
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Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,963
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Re: New Master cylinder weeping in back around piston
Tim brake seals should NOT swell up. If they did it could cause the pistons in either master &/or wheel cylinders to stick. I have seen this with AP racing master cylinders and worked with their engineers in England to resolve the issue. They had made a batch of seals with wrong material.
I have used several of that same master cylinder with zero issues. I dismantle all new master & wheel cylinders clean them polished their bores with a tool I have made to hold a strip of scotchbright that I use with high speed drill motor clean again. Paint with brake fluid resistant paint. Clean once again & assemble using nothing but brake fluid as a lubricant. All of our race components are also assembled with brake fluid only as a lubricant. Last edited by KiWinUS; 09-08-2020 at 01:40 PM. |
09-08-2020, 02:29 PM | #22 | |
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Location: NJ
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Re: New Master cylinder weeping in back around piston
Quote:
Just for piece of mind sake, I'll clean up the bore and put a new seal in it. |
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09-08-2020, 02:38 PM | #23 |
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Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,963
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Re: New Master cylinder weeping in back around piston
We now QC all seals by soaking them in brake fluid for at least a week prior to use to be sure they do not swell in any way shape or form.
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09-08-2020, 02:39 PM | #24 |
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Location: NJ
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Re: New Master cylinder weeping in back around piston
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