1968-72 Master Cylinder Broadcast Codes vs. Bail Tag Codes
Once GMAD buildsheets were introduced in 1973, after about 1974, master cylinder broadcast codes were the same as the bail tag codes. I can confirm broadcast codes by finding what was called out on the buildsheet...the same listed in the tech guide for the paper bail tag...all of which reconciles nicely.
But apparently, looking at 68-69 and 70-72 tech manuals (old editions), bail tags differed from the M/C broadcast codes. I see that at 68-69 DC was the code for manual brakes but carried YA for the bail tag. In 70-72, looks like DC for manual and the YA for the tag. And the same practice for power brakes during those years with the code PG and the tag TG. Late 72 codes shift from early 72.
So why this practice during the 1968-72 production years? Is the rationale understood or is it speculation?
My point: I find continuity after 1973 but not from 1968-72. Am I missing something?
But apparently, looking at 68-69 and 70-72 tech manuals (old editions), bail tags differed from the M/C broadcast codes. I see that at 68-69 DC was the code for manual brakes but carried YA for the bail tag. In 70-72, looks like DC for manual and the YA for the tag. And the same practice for power brakes during those years with the code PG and the tag TG. Late 72 codes shift from early 72.
So why this practice during the 1968-72 production years? Is the rationale understood or is it speculation?
My point: I find continuity after 1973 but not from 1968-72. Am I missing something?
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