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Discussion Starter · #1 · (Edited)
Hi,
(Apologies for log post pictured at the bottom)
So as the title states I am unsure which master cylinder will be the correct replacement, and as you can see from the pictured after sitting for nearly 30 years it needs it.
Technically a 1969, and believe it was not originally disc front.
I just replaced the rear brakes, drums/shoes/hardware all perfect replacement fit for 1969 (though assuming there is an age range same fit).
Looking for replacement parts online and the only one that looks the same is the "1970-1973 Chevelle Square Master Cylinder With Bleeders, Disc Brake" (not sure if links can post here) as the 1969 with the dual bleeders seem to have the rounded tops.
I am not sure if there is any real difference between the 2 other than the tops.
I cannot seem to find any part numbers on the brake booster.
Pictured attached of the assuming part number printed on the bottom of the master cylinder but I can't find any references to it " EIS 142 " of at least that is what it looks like I tried to wire brush it to get clearest pictures.

Thanks for any help!
Again I'm not sure if it really matters which one I use provided it fits against the booster? you let me know
I can of course try to find any addition info is needed

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Discussion Starter · #2 ·
I have done quite a bit of searching and think it is a '70. I pulled the booster as the M/C was leaking into it to replace as well, it has 939 stamped on the rear which just from a search her showed someone say '70.

I am assuming these are all fairly interchangeable. Looking at a place like ss396 it shows 64-72 Booster and M/C bundles. If anyone can confirm this?

Also I am assuming the 11" on the booster is the diameter?
 

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It looks like a 1970 M/C. Look at the flat area at the front and there should be a
2 letter stamp. BB or something like that.
IIRC A 69 has a rounded body and uses 2 retainers for the cover.
 
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