Master Cylinder Identification?

[383FormulaS]

I'm sure this had been answered somewhere but I could not find it with the search function.
I have a 65 d100 that has a hydraulic clutch both brake and clutch masters are on the vehicle and I found a spare master cylinder in the tool box that I would like to rebuild. How do I identify if it is for the clutch or for the brakes?

[PwrWgnDrvr]

Brake master has residual pressure valve in the output port, clutch master does not. Google it for more detail.

[383FormulaS]

Thanks PrwWgnDrvr that's what I was needing to know! I torn it apart and it is a clutch master is there any where to source kits for these that you know of.

[PwrWgnDrvr]

I'd start with Napa, or any other old school parts house in your area.

[BigBlockTrucks]

Not sure about the brake master but I bought a clutch master from autozone. They had it in 3 days. It was under $40. At that price it wasn’t worth my time to hunt down a rebuild kit.