Master cylinder julian dating

[Brad M.]

I have a follow up question to an earlier post regarding the julian dating in the machine bossed area of the master cylinders. What do the characters in this stamp represent (other than day of year)? Does this contain a year or just the julian day within the year?

I looked in this area on the master cylinder of my 71 and it appears to read BRD122 (it may be possible that the D is a 0, but looked like a D).

By the way, mine was right side up.

[Alan S.]

Re: Master cylinder julian dating

Hi Brad,
The standard brake master cylinder on my 71, mid -January built car, has 0338 stamped on the machined boss that the front brake line screws into.
The 0 is a little 'light' but the rest is quite clear. You can read it right side-up as the m/c is mounted in the car. It's located at the top of the boss near the bleeder screw.
Regards,
Alan

[Brad M.]

Re: Master cylinder julian dating

Thanks Alan.
I am not sure if mine means 22nd day of 71 (1 22) or if there is another set of stamped numbers without the preceding letters that I need to look for (I did not sand down around the full circle of the boss to see if there are additional stampings)

[Terry M.]

Re: Master cylinder julian dating

Don't sand the surface. Sanding will remove material. Use a wire brush -- a wire wheel in a portable drill works well, and the wire wheel will not remove material.

[Brad M.]

Re: Master cylinder julian dating

A wire wheel would probably work great if the master cylinder were off the car, but given it is on the car and there is only a couple inches from the painted fender, I am certainly not going to run a wire wheel there.

Any thoughts if the code BRD122 includes the julian date or is something else?

[Terry M.]

Re: Master cylinder julian dating

My thought is that the date is 0122. I have seen some 1972s with the broadcast code as part of the date stamp -- that later code HW, I think. I don't know about BR though.

When I was team leader the manual specified that these codes were not to be judged because there are some that just make no sense.

The original MC from my 1970 has the single number 1 as the only stamp. I have no clue what it means.

[Brad M.]

Re: Master cylinder julian dating

Terry, thanks very much for the additional info. I will look closer at the third digit sometime to see if I can distinguish between 0 or D.

if it is BR0122 and the 0122 represents 122nd day of 70, it would be quite early for my 71 with build date at end of May 71, but would not be impossible, I guess.

[Patrick H.]

Re: Master cylinder julian dating

I have seen some 1972s with the broadcast code as part of the date stamp -- that later code HW, I think.

It appears to be HC(?) on my late 72.

Patrick

[Terry M.]

Re: Master cylinder julian dating

Maybe that's it. I posted it without looking it up. My point was that later on the broadcast code began to show up on the line with the date.

All this just confirms my belief that there is too much about these stamps that we don't know.

[Harmon C.]

Re: Master cylinder julian dating

I know that all 73-77 master cylinders had the date and code stamped the same as the tag. In Bowtie judging I pointed this out to a team who ask me about a master cylinder that had no tag.

[Alan S.]

Re: Master cylinder julian dating

Hi Brad,
Here are 2 pictures of my date stamp. I thought the position of my characters might help you decide what you have. Sorry about the paint, the pictures are about 25 years old and I didn't know better; I was just stopping rust.





Regards,
Alan

[Kenneth T.]

Re: Master cylinder julian dating

Allen,

I have a '71 no power brake. Is the date a judging issue? I have the correct master and DC on it.?

[Alan S.]

Re: Master cylinder julian dating

Ken,
I believe this is just a matter of curiosity, not a judging issue.
Regards,
Alan

[Joe L.]

Re: Master cylinder julian dating

A wire wheel would probably work great if the master cylinder were off the car, but given it is on the car and there is only a couple inches from the painted fender, I am certainly not going to run a wire wheel there.

Any thoughts if the code BRD122 includes the julian date or is something else?

Brad-----


If you use a 1/2" drill with an 8" wire wheel, I can see the reason for your concern regarding fender proximity. However, if you use a 1/4" drill with a 1-1/2" or 2" wire wheel, I can see no problem, at all, with contacting the fender. If you cannot do it comfortably, safely, and with no contact whatsoever with the fender as described, then I'd say you need to be pretty darn cautious about getting involved in ANY other work on the car.