Can you please share some BREP files in this issue? Any maybe a link to the specification? I have no idea how complex this standard is but maybe someone wants to start with an implementation.
Here is the occt_brep_format.
I exported two brep files with freecad.
brep_files.zip


I find a brilliant project jsketcher may be helpful. Their website is http://web-cad.org/.
There is another software cadexchanger which can export many 3d files to brep format.
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Here is the occt_brep_format.
I exported two brep files with freecad.
brep_files.zip