I guess I am trying to decipher what "THE RAMMAN" is trying to convey here, sadly he is not clear (but at least he's not typing in "ALL CAPS" like he did in the past).
But I think he is saying that since the master cylinders with 2229171 casting numbers (Chrysler number 2944453)were only used on cars manufactured summer '69 to summer '70, the date code decoding information I have given cannot be true since he has found numbers that would translate into being from later years like '74 and '75.
If my translation of his post is accurate, then I think he has a fundamental misunderstanding of the life cycle of OEM master cylinder manufacture.
A master cylinder is considered a
wear part , just like a brake drum, rotor, wheel cylinder, etc. It is a part that was expected to wear out or go bad on a regular basis and thus need to be replaced. Therefore, production of 2229171 master cylinders did not grind to a halt after the last '70 Barracudas and Challengers rolled off the line in the summer of '70.
The disc brake master cylinder for these applications was one year, two car lines, only, and therefore was not high enough volume to justify the aftermarket brake companies tooling up to manufacture their own versions of this part. OEM Bendix is the only company that ever made them.
They sold them to Chrysler to sell as part number 2944453, and to other companies like Raybestos RM, Wagner and Master Brakes. To this day sometimes an old inventory of some of these brands of brake parts will turn up and something like a 2229171 or 2229191 casting number NOS master cylinder will turn up in one of those dusty old boxes.
These companies each had their own numbering systems, for example, if you find a Raybestos RM MC36393 master cylinder sitting on a table at a swap meet, grab it! (or better yet, send it to me!) It's a 2229171.
Bendix kept manufacturing these master cylinders as long as demand was enough to make it profitable to continue making them. For the 2229171, from what I have been able to figure out, they were made for around 9 years before they stopped. I have never seen one with a date code later than '77 or '78.
From my days working at the company that sold Raybestos and Napa United, I can tell you from sales forecasts and histories, that the sale volumes of master cylinders would be peak out 3-5 years after a car's model year. After 5 years or so, sales would drop off as numbers of cars from that model year on the road would decrease from accidents, wearing out, rusting out, etc.
Thus, the most common datecodes that I see on 2229171 master cylinders are from '73 and '74.
Which is exactly what we would expect to see...
Some of the filler caps provide further evidence as to when these master cylinders were manufactured. During the '70 model year, the caps were stamped "USE ONLY SAE J1703 BRAKE FLUID". I have had NOS 2229171 master cylinders with "9 ###", "0 ###", and "1 ###" date codes that have this callout on the lid. On every one with "2 ###", "3 ###", and so on, that I have had the opportunity to inspect, the cap is always blank. They stopped stamping this callout at some time in '71, so that correlation is further evidence of the date coding system.
I have seen similar evidence with the A body disc (2225541 casting number) and B body disc (2226821 casting number) which both used the same cap (not the same cap as used on '9171's and '9191's though).
In ones with early '69 date codes and earlier, the caps say "USE ONLY SAE 70 R3 BRAKE FLUID", and by mid to late '69 and later datecoded examples the caps had the "J1703" callout.
There is actually another datecode found on these master cylinders, which is cast into the casting.
This number is proceeded and followed by the imprint of a screw head, as this is the casting date code, and was cast in by means of a metal insert with the code that was attached to the pattern with screws prior to the sand molds being made from the pattern for a particular run of castings.(the numbers found on the side of the casting were stamped in at assembly).
I have never studied this casting date code in detail to fully understand it. I did once sell a '69 date coded B body master cylinder to a Moparts member here, and he emailed me a month or so later telling me how he'd looked at this casting date code and translated it, and that it was 2 months or so before the assembly date code, which certainly makes sense.
So, I hope this all "flies" now.
The disc brake Mopar master cylinders from '67-'71 are pretty well understood now I think.
I still haven't figured out some details of the drum brake master cylinders used on just about all of the millions of '67-'70 Mopar drum brake cars and light trucks made.
There are 4 different casting numbers (actually 2 different casting numbers, one casting letters(AANF), and one with apparently nothing)observed on this style, 2 different styles and locations of date codes depending on which casting number, production that took place in 3 decades (60's, '70's, and '80's) confusing the date coding issue (was that "7" 1967, 1977 or was it 1987??)and the apparently controversial issue of black e coating observed on some NOS and used castings, were the ones installed on the cars originally black e coated or bare cast iron?
Hopefully someday these will be fully understood, as they are the most commonly used master cylinders from "back in the day".
