Wrong Master Cylinder?

Do you remember the part#?

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


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...

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.