Chevi
Contributor
Posts: 121
Loc: Eastern NC
Reg: 07-13-08
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07-04-23 01:19 PM - Post#2859971
I recently posted a question about master cylinder fluid loss. The responses were all good and in time and finally climbing under the hood I discovered a leak. Fluid is leaking out from under the flat plate cover on the master cylinder. It takes quite a while to create a problem but it does exist. I cannot locate a gasket and I believe they are not available. So my question is; what is the best material to use to make a gasket for this application and is there a sealant that I should also use to make a positive seal. Any guidane will be much appreciated. Chevi
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Jalapeno
Member #252
Posts: 9918
Loc: The Hill Country of Texas
Reg: 04-30-00
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07-09-23 12:03 PM - Post#2860149
In response to Chevi
It would be very unusual for the leak to be at that location, unless the MC is corroded enough to allow fluid to flow. DOT 3 brake fluid and aluminum do not get along and it is a common area of corrosion. I would always resurface that area when I restored them. So take off the flat cover and check the condition of the MC.
A much more common area that leaks is between the MC and the booster, which would look almost exactly the same. There are many ways that leakage could occur there.
The material for both areas is cork/rubber.
Edited by Jalapeno on 07-09-23 12:03 PM. Reason for edit: No reason given.
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 docjns1
"4th Year" Gold Supporting Member
Posts: 411
Loc: upstate NY
Reg: 11-12-19
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07-11-23 05:12 PM - Post#2860206
In response to Jalapeno
Years ago I had a '57 Olds 88, used Kanter Auto Parts out of NJ for a bunch of stuff including a rebuild kit for the treadlevac. I dont recall whether it had the gasket you need (or whatever version I would've needed) but they'd be worth a call or check their website. It sounds more like you may need a seal for the actual piston/rod portion of your MC rather than a gasket between the body of it and treadlevac. The piston/diaphragm in the treadlevac uses a leather seal around its circumference to the canister portion.
Steve
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'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif |
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Chevi
Contributor
Posts: 121
Loc: Eastern NC
Reg: 07-13-08
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12-24-23 05:21 PM - Post#2865209
In response to Jalapeno
Cork gaskets and I do not get along with each other, and Im always careful with tredlevac gaskets because they are extremely hard to locate and prices are extremely high. That said; I located the gaskets I needed at HarmonClassicBrakes.com. The gasket comes in a kit numbered 62-819 for the 55-57 Chevy. And the price was much lower than our normal tri-five sites. Once I had the new gasket I "torqued" down the screws on the MC cover and the leaked stopped. Now I know where to locate a replacement gasket if needed. Thanks for the response. Chevi
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