Wrong Master Cylinder?

kittypancake said

Do you remember the part#?

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The Raybestos one I wanted is a MC36406, but I couldn't find one locally so I purchased a new one from O'Reilly's that crossed to their #BHH NMC11145. This a new MC, NOT a rebuild unit. I won't buy a rebuilt MC

kittypancake said

So...your original 4piston disc master cylinder was the equal reservoir style? If that's the case, perhaps I don't have the wrong master cylinder. The 1972 Chrysler Chassis Manual says disc and drum masters have different bail, cap, and gasket...they didn't add an "except for when they don't" disclaimer...

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Yes, KH disc manual brakes with the equal reservoir MC as shown above. It was still working fine, but I wanted better/easier pedal pressure.