Maurice, You may not be aware that the Ford and Chev brakes of the F8 and C8 are of Chev design, and that all the other (C15, F15, and up) CMP's, use brakes of Ford design.
I guess the Ford / Chev b.s. was happening then, like now, and that some of parts drawings were not given of 100% effort by the biased Chev people
O.K. then if that is not acceptable. then there were lots of errors in early war manuals and parts books, because of the rush to get them out. I think they did a fantastic job.