spongebob Posted November 15 Report Share Posted November 15 i tried to use an o ring on the fill cap for the master cylinder on my 54 windsor. it does not seat properly and i actually ended up with a small piece of it broken off and ending up inside the master. the original one is a metal crush washer but i have not found one available anywhere. a teflon washer of this size would work, but where to get one? these small parts can often be hard to get. and as an aside, hidden valley auto parts is closing early next year. you can bring tools and get what you want. dennis Quote Link to comment Share on other sites More sharing options...
soth122003 Posted November 15 Report Share Posted November 15 (edited) Are you sure it's a crush washer and not just a soft thin metal washer? If your just looking to seal it, try the hardware store for a washer in the plumping supplies. Or you can use thin cork gasket material and cut one your self. Joe Lee Edited November 15 by soth122003 Quote Link to comment Share on other sites More sharing options...
Sniper Posted November 15 Report Share Posted November 15 McMaster-Carr or even Grainger are two places I go for stuff like that. Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted November 15 Report Share Posted November 15 (edited) I looked in my wagner brake catalog and looked up the master cylinder info for your car. You use the filler cap # FC4073 and the gasket is FC5922. refer to the picture 13c which is the filler cap and the gasket which is listed below it as FC522 Then go to picture 14 filler cap gasket FC5922 is listed as a fibre gasket 1 17/64 - 1 1/2 If you go to a Napa store with this information they might have it in stock or can order you one. This is again where having cross reference and old car manufacture catalogs comes in handy. On the last page go to the bottom of the sheet and look at FE17632 that is your master cylinder for your car Rich Hartung Desoto1939@aol.com Edited November 15 by desoto1939 Quote Link to comment Share on other sites More sharing options...
spongebob Posted November 15 Author Report Share Posted November 15 desoto, alot of good info there. thanks. i have a napa nearby. i remember that the gasket was a thin metal washer, but having the correct fiber one should be better. thanks, dennis Quote Link to comment Share on other sites More sharing options...
chrysleritis Posted November 16 Report Share Posted November 16 You don't need much of a tight seal on the fill cap on the master cylinder. The caps all have a small air vent hole in them, strategically placed so as not to let dirt in. So the gasket under the cap can really be any old thing as long as it does the job of keeping out crud. DIY cork or fiber should be fine, and I've had some janky-looking homemade gaskets on there over the years. Probably you're the only one who sees it! I prefer fiber, since it won't flake apart like a cork one might, which would land you back in the same place as with your piece of o-ring... Quote Link to comment Share on other sites More sharing options...
spongebob Posted Tuesday at 02:58 PM Author Report Share Posted Tuesday at 02:58 PM the reason i want a proper gasket is because i am losing brake fluid and cannot find a leak at any of the wheels or lines anywhere. while filling the master i saw that the oring i used as a gasket was ripped and a piece of it was inside the master. i think the fluid is coming out at the cap where the is no seal when you use the brakes. only way to confirm this is by having a proper seal on the fill cap. the fiber one is best since it will squish on and make up for the small amount of rust in that area. last time it went low it did allow some air in the system so now i have to bleed the whole thing. dennis Quote Link to comment Share on other sites More sharing options...
bacelaw Posted Tuesday at 03:34 PM Report Share Posted Tuesday at 03:34 PM 35 minutes ago, spongebob said: the reason i want a proper gasket is because i am losing brake fluid and cannot find a leak at any of the wheels or lines anywhere. while filling the master i saw that the oring i used as a gasket was ripped and a piece of it was inside the master. i think the fluid is coming out at the cap where the is no seal when you use the brakes. only way to confirm this is by having a proper seal on the fill cap. the fiber one is best since it will squish on and make up for the small amount of rust in that area. last time it went low it did allow some air in the system so now i have to bleed the whole thing. dennis You might be overfilling it. The book for my wagon says 1/2" *below* the top of the resevoir is the maximum. Quote Link to comment Share on other sites More sharing options...
Bob Riding Posted Tuesday at 04:26 PM Report Share Posted Tuesday at 04:26 PM Moparpro makes a replacement cap Master Cylinder Fill Cap Might give him a call to see if he has or knows what would work. Quote Link to comment Share on other sites More sharing options...
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