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Old 02-13-2021, 08:53 PM   #1
Gigem
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What brake booster is this?

I have this leftover brake booster that I don't need anymore and want to sell.

I bought this for my 1972 GMC from LMC Truck. I have the old order, and the part number from LMC was 34-4321. See it here.

https://www.lmctruck.com/1967-72-che...-brake-booster

When it showed up at the guy's house who was helping me with the truck, he said that the booster didn't line up to the brackets on the truck. He said the bolt pattern on this booster was bigger than the bracket on the truck, if I recall. I ordered some new brackets from Jeg's, but instead of using them I found another booster somewhere else that fit the existing brackets so we ran with that.

Any idea what this booster is for? It was like $130 from LMC, and has never been used. I'd like to sell it and the Jeg's brackets, but I don't want to misrepresent the parts and mess someone else up.

Any thoughts? Thanks!
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Last edited by Gigem; 02-13-2021 at 09:13 PM.
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Old 02-14-2021, 12:30 PM   #2
MikeB
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Re: What brake booster is this?

Does your truck currently have the factory booster, or are you replacing a manual system?

BTW, several "thumbs-up" to you for being totally upfront about the booster. You're way too honest for eBay!

Just found this ~20 year-old photo of my 69 C10. The bracket, booster, master cylinder, and combination valve came out of a 71 or 72 junkyard truck. The booster leaked so I had it rebuilt in 1995, and it still works!
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1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
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Last edited by MikeB; 02-14-2021 at 12:37 PM.
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Old 02-14-2021, 12:39 PM   #3
Andy4639
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Thumbs up Re: What brake booster is this?

With that bolt flange on the fire wall side of the booster I say it's a late model booster that mounted straight to the fire wall. As far as year I have no idea.
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Old 02-14-2021, 12:45 PM   #4
MikeB
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Re: What brake booster is this?

Quote:
Originally Posted by Andy4639 View Post
With that bolt flange on the fire wall side of the booster I say it's a late model booster that mounted straight to the fire wall.
Good catch. Also, what is the diameter? It should be around 11 inches.
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1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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Old 02-14-2021, 06:05 PM   #5
Gigem
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Re: What brake booster is this?

Quote:
Originally Posted by MikeB View Post
Good catch. Also, what is the diameter? It should be around 11 inches.
Diameter is approximately 10.5 inches. The 4 bolts that hold it to the bracket are 3.5 inches on center.

There is a part number on the booster. 3M108. I google that and can't find anything.

I think I'll just put it on eBay with a lot of disclosure verbiage and these measurements and dimensions and see what happens.
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1972 Chevelle SS Convertible (gone)
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Old 02-15-2021, 05:21 PM   #6
68 TT
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Re: What brake booster is this?

Quote:
Originally Posted by Andy4639 View Post
With that bolt flange on the fire wall side of the booster I say it's a late model booster that mounted straight to the fire wall. As far as year I have no idea.
I agree. With the size it may be the S10 Blazer or possibly Astro van version. The 88-up C/K trucks I have used a larger diameter and deeper profile version than that.
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Old 02-14-2021, 12:42 PM   #7
MikeB
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Re: What brake booster is this?

That engine compartment looked so ugly back then, I just have to post this photo from 2 years ago!
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1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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Old 02-15-2021, 10:09 PM   #8
Warrens69GMC
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Re: What brake booster is this?

MBM-11004

http://mbmbrakes.com/1967-1972-chevy...brake-booster/
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Old 02-16-2021, 12:19 AM   #9
Gigem
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Re: What brake booster is this?

Quote:
Originally Posted by Warrens69GMC View Post
Yeah, that! No idea why it didn't fit, but that is exactly what I have. Anyone need it???
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1980 Chevy Stepside (gone)
1987 Chevy Blazer (gone)
1972 Chevelle SS Convertible (gone)
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Old 02-16-2021, 09:48 AM   #10
70STOVEBOLT
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Re: What brake booster is this?

That is a Delco Moraine style booster. A lot of our trucks used a Bendix style, but I think they will both work with the correct mounting brackets.
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Old 02-20-2021, 12:14 PM   #11
MikeB
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Re: What brake booster is this?

Just occurred to me that LMC has a decent return policy. Have you called them?

https://www.lmctruck.com/faq/orders-...fore-returning
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1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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