55 Master Cylinder Question

New to the forum and new owner of a 55 T Bird. Anyone seen a 55 master cylinder that is rectangular in shape with two brake lines coming out of the master cylinder? Looks like it has two pistons or ports in the master cylinder. I can't find anything that looks like it on the T Bird sites. The car has been in dry covered storage for over 30 years and of course the master cylinder was dry as a bone. It has a rectangular lid that has a long bolt that holds the cap on. I had to remove the drivers side hood latch to get the cap off. It also has 56 side wings and what I believe to be a 312 with a big Holley carb on it. It clearly has a 312 intake and exhaust manifolds but I will have to see the crank to find out if it has a notch in it to determine if it is really a 312 or not. I must admit the master cylinder has me stumped. Might just put a 67 Mustang dual bowl on it like I did my Comets and Ranchero's. Any help would be appreciated.


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Here's one from 55. Not sure what that one is
That master cylinder appears to be from a 1960 or so International Scout or Travelall and is intended as a combination brake and clutch unit. I have no idea why someone would do that, but I suspect that the firewall was cut and modified for the installation. Is this a standard transmission car? It is not a dual master cylinder as in it does not have a separate compartment for the front and rear brakes.
 
That master cylinder appears to be from a 1960 or so International Scout or Travelall and is intended as a combination brake and clutch unit. I have no idea why someone would do that, but I suspect that the firewall was cut and modified for the installation. Is this a standard transmission car? It is not a dual master cylinder as in it does not have a separate compartment for the front and rear brakes.

I will check tomorrow but I think both hydraulic lines look like they went to the brakes. It would be cool if the clutch was hydraulic but I doubt it. I could not find a T or hydraulic brake light switch in line. I have not looked under the dash so I don't know what is actually under there. It is a manual transmission with overdrive. If the dash isn't hacked up I will most likely put a 67 Mustang dual bowl master cylinder in it with nickel copper alloy brake lines. I have used that set up on several Comets and Falcons with good success. The car was way ahead of its time with several modifications, later year model parts, aftermarket items and chrome. I want to replace the entire brake system with new parts, wheel cylinders, shoes, hardware, rubber hoses, wheel bearings, seals, etc even though the drums look new. Any recommendations where to get the parts I need to do this?
 
Several of the Thunderbird parts suppliers have the brake parts you need. If originality is not your thing, I understand that Speedway Motors has a Willwood disc brake conversion kit for the 1955 Thunderbird for about $650. Mac's has a nice kit for 4 wheel drum brake cars for about $200. I will keep my personal opinion to myself as I believe the owner of the vehicle has the right to modify it as suits him. Several suppliers including Larry's and Macs have the brake line kits in both standard and stainless steel.

As far as the master cylinder you nave now, perhaps the person modified it so that the brake pedal operated both pistons so that one operated the front brake and the other the rear. The distribution block would have to have been modified so that the two systems for front and rear brakes would be separate. In any case, that master cylinder was designed to be a single reservoir for the brake and clutch master cylinders.
 
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