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| | | Joined: Oct 2022 Posts: 29 'Bolter | | 'Bolter Joined: Oct 2022 Posts: 29 | The rubber seal on my 66 master cylinder top has a split. are these rubber pieces available separate? Thanks stan | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | A piece of rubber gasket material from Ebay and a pair of scissors would probably be a simpler option than trying to find something from nearly 60 years ago. That material is available in all sorts of sizes and thicknesses at dirt cheap prices. Use the old one as a template to whittle out a new piece.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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| | | | | Joined: Oct 2022 Posts: 29 'Bolter | | 'Bolter Joined: Oct 2022 Posts: 29 | That's an idea. I wonder what material is compatible with brake fluid? Stan | | | | | Joined: Aug 2018 Posts: 759 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 759 | I don't really know, but I would guess neoprene
Mike Burns
1940 Chev 1/2 ton
1953 Chev 1/2 ton
1950 Studebaker Starlight Coupe
1947 Indian Chief
1943 Indian 741
| | | | | Joined: Sep 2009 Posts: 5,823 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,823 | Stan, According to a search here gmpartswiki for a "66" master cylinder top gasket, the original GM Part# is 5465109 (actually applies to '60-'66 per the Master Parts catalog). A search on the web showed this result GM 5465109This what your looking for??? Hope it's helpful! 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Oct 2022 Posts: 29 'Bolter | | 'Bolter Joined: Oct 2022 Posts: 29 | That is for another master cylinder. Foe the price I could buy it and hope it is big enough to cut my round top gasket. Thanks stan | | | | | Joined: Sep 2009 Posts: 5,823 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,823 | Stan, Can you provide a picture of your existing master cylinder. If a "round top", almost sounds like the standard equipment used on '66 and earlier cars - not a truck cylinder??? 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Oct 2022 Posts: 29 'Bolter | | 'Bolter Joined: Oct 2022 Posts: 29 | I did notice the master cylinders I have on my C10, and my other C20 uses the same ones that that the cars use. Probably a lot of swapping parts back them at the factory. I had a new 65 chevy car back then. Probably used the same master cylinder? Stan | | | | | Joined: Sep 2009 Posts: 5,823 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,823 | Stan, If it is the same as the auto style cylinder, those gaskets are readily available at most Flaps. Here is a listing from Advance Auto Parts: 1966 Round master cylinder gasket
Last edited by Gdads51; 11/02/2022 11:42 PM.
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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