The TBird parts suppliers have a metal cap that may fit

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Thanks Gary! Thats what I was  hoping to hear. I have a cast iron  reservoir with a plastic cap. I have not been able to match the threads to anything in metal to replace it. When and if I do, I will install a metal cap, drill for a hose fitting connection, then run to a remote. I will make sure the remote fill lid is vented, this should work based on your experience. Thanks a lot for getting back to me on this.

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

Can anyone explain the concept of a master brake cylinder and how to convert to a remote fill?  I am assuming all that would be necessary is to install two fittings in the existing main reservoir, run two lines to a remote fill. One line would run from the remote fill to the main master cylinder and the other line would run from the main master cylinder back to the remote reservoir to vent the remote. Is this correct? The goal is to be able to fill the main reservoir from the fireball opposed to under the floor boards of a 56 Ford F-100. I will eventually swap out the front drum brakes for disk brakes so this is just a temporary fix, one of them that could last years.

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's