Brake booster & master cylinder - what are they from?

Typo, meant EA. The correct for 70 Stage 1

Good idea, I'll have to check. Yeah I was thinking of trying the hold off myself. And already was looking at whitepost for the master. Mike did mention he sends them out and prefers stainless. I'll have to take a picture of the master when I get home, not sure if it needs rebuilding or not.

 

Early 70 Framingham car. Hard to get a pic of the upside Delco but here it is:

 

Took some pictures of the EA master cylinder I have and guess it probably needs to be sent out just in case. Bought from a reputable source but don’t have any history on it as whether it worked/not worked.

 

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003 and...

 

After reading through this thread,the master cylinder and booster from my GSX has 97 stamped on the tab and Delco upside down too. That should be April 7 1970?? I don't know how to decipher the master cylinder though.

 

@bignastyGS what number do you have on the other side of the tab on the booster? Opposite of 97?

there is a two letter code on that front tab on the master. Top side. Tried to draw blue arrow. I’ll look for the thread with the codes.

 

looks like the back side of the tab hs 1076 on it and the code on the master cylinder is EA

 

Thanks! Awesome 1076. Just no delco stamp for me. EA is for power disc. and found the picture in the other thread I was looking for.

 

Good info

 

I ask this question to the judges and experts @Smartin @Duane @thepartsman

my car is an 01B second week of January and have a dated coded master 338 which is 12/3/69. Booster has 1076 which we know is a stage 1. From what I am told, this is the original booster without the Delco stamp.

@Staged70Lark has an 01D build 4th week Jan with a dated code of 356 which is 12/22/69

both built at Flint both without the Delco stamp both with 1076 part number

@john.schaefer77 Has an early Framingham build with the stamp. What is your car build date and booster date please?

I heard 67-68 no stamp.

so could mine and @Staged70Lark be early boosters without the stamp.

my problem is that I am in the process of sending it to be rebuilt but I don’t want the judges to ding me in concourse because it doesn’t have the Delco stamp. Essentially pay $400 to rebuild my original booster only to have judges tell me it’s not original because it doesn’t have the stamp. Thoughts

 

The 1076 does not have anything to do with stage 1, it identifies the year. I am not sure if the 70 Flint had the upside down Delco stamp or not. Could be a hit or miss thing.

"Booster has 1076 which we know is a stage 1."

 

I have this brake booster. That’s possibly for a 72 with the Delco marine upright on the top. 1929 stamp, how do you decipher the day codes?

 

I believe 1929 is for a 1971. The date code is on the other side of that tab and would be just the day of the year. So the tab would have 1929 on one side and then a 3 digit number on the other side for the day of manufacture.

I found a booster from a junkyard that has the Delco stamp and it's actually a 1929 part number. Not sure if its a 71 or 72.

• Thread = 1971 02C Original Brake Booster question | V8buick.com
• edit: found this thread with 1929 from a 72 Buick Primium Finish 70 GS Power Brake Booster Source Needed | V8buick.com

My plan was to take the junkyard front half with the Delco stamp and put it with my back half that has the 1076 number / 338 day date code to pass the concourse judging because they want the booster to have the Delco stamp. I hate to do that because I'm wrecking a good 1929 booster core just for judging.

No one can confirm or deny on paper (forum) that there may have been some 1970 boosters had no delco stamp. I have heard from a couple individuals that early ones did not have the stamp. But it's all verbal with no proof. Other than a picture of mine, a picture of another's above and one sitting in an original car locally.

 

Thanks Nick for the verification on the year. Sorry you have to go through the trouble for concourse anything is possible back in the day they were building great cars not perfect cars. Good luck with your project.

 

@Stage 2 iron - No worries and thanks! I edited my post above. Found conflicting info on part number 1929. Earlier thread shows from a 72 from like what you think or a new thread from a 71. your guess is as good as mine.

 

Picture of the code View attachment 669743 looks like 090 possibly at two or seven

 

For the 1929 crowd: just pulled my booster off of my 71, built 04E and it’s stamped 110 (front), 1929 back. No reason to think that it’s not the original booster, although that date code if I’m reading it correctly is only a week or so before the build date of the car

 

110 looks like April 20'th a Monday