BRAKE BOOSTER CHOICE HELP/REVIEW

[toyinhawaii]

Strange!! reposting my thread, looks like it disappeared after i edited it:

My Original booster is bad (via testing), i think i pulled the trigger on this to soon as the Blazer booster and reservoir would have been a good choice as well (let me know if this is true), but what is done is done. I have an 84' elky with an LT1 and Blazer brake set up, only in the front but i do have the rear disc ready to go , so still have the drums in rear. i bought the below on Ebay and was wondering if you guys had any experience with this, seems like that seller sells a lot of them. There are no identifying marks, engraving or stickers on it, so cant really identify a mfr. But of course when in doubt assume china made. i pulled the old booster off and noticed the 4 mounting studs are larger than the new ones are. The chrome nuts are 13 mm and the OEM is 15 mm, bolt pattern is the same but the studs on the chrome one seems just a little shorter... approx. 1/8". when they say 8", they are talking about the diaphragm diameter?? so i measured both and it is 8" but in a different location and also the booster is smaller than the OEM . does what i have look right.. as far as the size differences. is something like this a normal aftermarket OEM replace/ performance replacement? Thanks for the help.

8" Dual Chrome Power Brake Booster & Ball Milled Flat Top Master + Brackets | eBay

Brake Booster Features Master Cylinder Features Plus, we have access to thousands of parts that are not listed. Square 4-bolt mounting bolt pattern with 3-3/8" centers.

www.ebay.com

 

[Sweet_Johnny]

Buy either a factory dual diaphragm 9" booster for late model G Body (post '82), or get a 12" dual diaphragm booster from a 1990 Caprice, or use the Blazer one. Get a master with a bore of 1.125" or 1.25". Look into the disc/disc proportioning valve.

 

[Ribbedroof]

From that seller, it's probably a Hoffman group product ...Hoffman has a terrible reputation on a lot of boards. The seller's feedback isn't great, either

Totally unrelated, but I went to 1-3rd grade in Hudson Iowa. Little town, was surprised to see so much stuff coming out of there

 

[toyinhawaii]

Buy either a factory dual diaphragm 9" booster for late model G Body (post '82), or get a 12" dual diaphragm booster from a 1990 Caprice, or use the Blazer one. Get a master with a bore of 1.125" or 1.25". Look into the disc/disc proportioning valve.

Thanks for the info, saw ROCK AUTO has a QUALITY BUILT B 1091 for an '81 and a B1039 for an "84. how is the quality remans of a "Quality rebulit"? I dont care for Cardone stuff, they are 50/50. Both are dual diaphragm ,is the older G body gens better? RA has this for the '90 Caprice (below) which is the bettter to choose from?. And for the Blazer brake swap we can do on the 98-02's is there any year that is more better for the booster? And yes i did get a proportioning valve from summit racing when i did the blazer brake swap. Considering the size differences between the chrome ebay one i got and my OEM.... is a larger booster the best way to go? What is the adequate vacuum PSI to have for our G bodies ? Is what they sold me adequate for a G body of my size and weight ?Sorry for all the questions and thanks for the knowledge on Boosters, not to knowledgeable in that area.

1981 CHEVROLET EL CAMINO 5.0L 305cid V8 Power Brake Booster | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

1984 CHEVROLET EL CAMINO 5.0L 305cid V8 Power Brake Booster | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

1990 CHEVROLET CAPRICE 5.0L 307cid V8 Power Brake Booster | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

 

[toyinhawaii]

From that seller, it's probably a Hoffman group product ...Hoffman has a terrible reputation on a lot of boards. The seller's feedback isn't great, either

Totally unrelated, but I went to 1-3rd grade in Hudson Iowa. Little town, was surprised to see so much stuff coming out of there

Hoffman?? never heard of them. i asked the seller a question before i bought the booster. "is the reservoir and cover chrome plated plastic or metal"... they never replied, but then about 5 days later i ordered. its all steel and looks like the reservoir is iron. i finally got it installed , bench bled the reservoir and the brakes. took it out for a drive and .... its ok. thats why i was asking about what should the proper vacuum psi i should have.

 

[Sweet_Johnny]

Thanks for the info, saw ROCK AUTO has a QUALITY BUILT B 1091 for an '81 and a B1039 for an "84. how is the quality remans of a "Quality rebulit"? I dont care for Cardone stuff, they are 50/50. Both are dual diaphragm ,is the older G body gens better? RA has this for the '90 Caprice (below) which is the bettter to choose from?. And for the Blazer brake swap we can do on the 98-02's is there any year that is more better for the booster? And yes i did get a proportioning valve from summit racing when i did the blazer brake swap. Considering the size differences between the chrome ebay one i got and my OEM.... is a larger booster the best way to go? What is the adequate vacuum PSI to have for our G bodies ? Is what they sold me adequate for a G body of my size and weight ?Sorry for all the questions and thanks for the knowledge on Boosters, not to knowledgeable in that area.

1981 CHEVROLET EL CAMINO 5.0L 305cid V8 Power Brake Booster | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

1984 CHEVROLET EL CAMINO 5.0L 305cid V8 Power Brake Booster | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

1990 CHEVROLET CAPRICE 5.0L 307cid V8 Power Brake Booster | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

I don't mind the questions, I'm just not the best source to be seeking advice from on the subject since I'm still learning as I go, and have yet to install my brake upgrades. I can, however, offer up some very good links that made their way to my Bookmarks list. I've read every single word and feel that each one has something valuable to offer in the area of brake knowledge, from specific upgrades to just plain awesome information.

I learned a lot from these and any other links mentioned therein:

Third Gen. GM F-Body Brake Upgrade - Spindle Modification

Third generation GM F-Body brake upgrade instructions on how to modify the stock spindle to accept upgraded brakes

lukeskaff.com

GM Brake Upgrade Option Measurements - Thirdgen F-body Brake Upgrade

GM Brake upgrade options, setups, and measurements

lukeskaff.com

Metric oversized calipers.

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gbodyforum.com

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maliburacing.com

master cylinder interchange

www.hotrodders.com

B-Body Dual Diaphram Brake Booster Upgrade

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www.montecarloss.com

NEW MASTER CYLINDER OPTION

This master bolts right in no mods and actually works AC DELCO Master Cylinder Part # 89056529 or 18M974 (same master)

maliburacing.com

98~05 Blazer brake upgrade! DONE!

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gbodyforum.com

LS1 Rear Disc Brakes: My Take On 'Em.

www.turbobuicks.com

LS-1 12" disc brake conversion for G-body

Many of you are probably aware of this conversion. I have completed this conversion recently on both my GN and my T-type. I got most of the parts from the junkyard, though I did purchase front hubs from http://www.flynbye.com. I'd recommend this upgrade to anyone with a G-body car. Certainly one...

gbodyforum.com

LS1 front brakes on G body spindle

LS1 front brakes on a G body is a pretty common upgrade. I have about 2k miles on my mostly homebuilt setup. Has been sucessful and thought I would do a how to with all the info in one place. I wanted to go with a blazer setup but I priced it out and in dirt car territory, I couldn't justify...

gbodyforum.com

1LE Brakes Parts List - Third Generation F-Body Message Boards

Brakes - 1LE Brakes Parts List - Does anybody have a parts list for 1LE Brakes, front and rear. I need part numbers for everything including the master cylinder. I have four wheel disc already but they are the small stuff..... I've read a ton of posts but nothing that had a complete list of part...

www.thirdgen.org

9" Double Diaphragm Brake Booster Differences Between Years

I'm looking to replace the power brake booster and master cylinder on my '78 Cutlass Supreme and have found a few options to choose from but am unsure of the differences between them. I've decided to go with the right hand drive S10 master cylinder with a 1" straight bore and a replacement 9"...

gbodyforum.com

Blazer booster to go with Blazer master?

I'm in the middle of swapping out the front and rear brakes for a set from an '01 Blazer and while I know plenty of people have used a RHD Blazer master cylinder, has anyone used the brake booster to go with it? Is it even needed? I basically got the booster for free from the parts car I got the...

gbodyforum.com

 

[toyinhawaii]

THANKS A LOT! I'll take a look at them and read up!

 

[Sweet_Johnny]

THANKS A LOT! I'll take a look at them and read up!

You're very welcome, glad I could be helpful.

 

[toyinhawaii]

From that seller, it's probably a Hoffman group product ...Hoffman has a terrible reputation on a lot of boards. The seller's feedback isn't great, either

Totally unrelated, but I went to 1-3rd grade in Hudson Iowa. Little town, was surprised to see so much stuff coming out of there

The chrome one isnt working out , yep i properly bench bled the master and pressed the brakes to bleed the cylinder then after the install bled the brakes too. So sending it back to the seller on ebay. Gonna get the more better caprice, blazer or pre-82 gbody elky.
Been looking and guess my eyes are getting glazed on which to choose from.. probably been reading all of sweet johnny links he posted .. haha. Follow up to your totally unrelated i spent my young years K-3rd grade growing up in Central City, Iowa about 13 miles north or Cedar Rapids..

 

[toyinhawaii]

Tried to google how to measure the bore in the MC to get an idea of how its measured. the ‘84 elkys use a 1” bore and the caprice/blazer use a 1.250”… IDK but look like i’m measuring wrong??? The left is the OEM W/ GM PN 18010023 and the right one is my 3 yr old napa one PN M2477 , both suppose to be 1” but obviously i am measuring wrong to get almost 1.5”