Someone may be along with a kit number for you. However, from the parts books it appears the W7s used two different master cylinders, one for straight hydraulic brakes and another for the Hydrovac brakes. So you need to know, and tell, which you are looking to get a kit for. Both master cylinders and parts kits show as unavailable in the Case parts books.
Many of those master cylinders and other brake system parts were made by Wagner back then. You may find a number cast into the housing that a good parts store (Traction, which deals in truck parts might be one) may be able to use that number to identify the cylinder and get a lit or replacement. You could contact the YT Store to see if they have anything (nothing for brakes shows in the on line listing of parts. You might contact Beauregard Equipment, they are your local Case dealer and someone there may have some notes of what fits as there are still a number of W7s around. Saeli*Implement is another that might possibly be able help. Another way is to take it apart and work with a parts store to find a kit with parts that match yours, bore diameter is a starting point. I know this would be your last resort as you say it works if you keep fluid in it.
If you don't have a parts book, here is a link to the Case W7 on line parts book.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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