GM models with 9 inch boosters

[corvettekid1973]

Is there a list of GM cars that came with dual diaphragm 9 inch boosters

[Skip Fix]

79-81 Trans Am 4 WD, NOT disc/drums. 81 yuses a larger MC register for Quick Take up MC aluminum vs cast iron 79-80s.

[corvettekid1973]

Okay thanks man. Do you think that will bolt up to a 69 camaro

[gray86hach]

These are nice. Same a DSE uses

http://m.summitracing.com/parts/tff-2224nc

Tim

[corvettekid1973]

I've seen those but my studs are on my firewall

[gray86hach]

They bolt to a bracket then to the firewall

[130fe]

Yeah, like Grey86hatch says, you have to buy the reduced angle brackets from DSE to use the tuff stuff booster. You also have to purchase the clevis kit. This thread is a gold mine of info regarding this conversion. https://www.pro-touring.com/threads/91277-DSE-M-C-amp-Booster-part-s/page2

[gray86hach]

http://www.detroitspeed.com/mm5/merchant.mvc?Session_ID=9994c323ddfa15a41d62972863 fe459a&Screen=PROD&Store_Code=DSAEP&Product_Code=050302

[gray86hach]

Allstar performance has the clevis for $14 or so

Tim

[rohrt]

64-65 A bodies had 9" booster too

[corvettekid1973]

Im learning towards the 81 T/A booster. I'm running C5 brakes on a 69 camaro. If my 4th gen master cylinder doesn't work with the 81 booster ill just or a 81 MC

[Apogee]

64-65 A bodies had 9" booster too

There are a lot of early GM 4-wheel drum applications that used a single-9" diaphragm booster, but that would not be advisable for a modern 4-wheel disc application IMO. The OP's question was regarding dual-9" diaphragm boosters. That said, C3/5/6 Corvettes all used dual-9's...the C4 used a bunch of variations over the years, so it's a bit more convoluted. The 4th-gen F-body did as well, however the firewall brackets on that unit are integral versus the universal 4-stud mount on the others.

Tobin
KORE3

[corvettekid1973]

Tobin how's it going. Im actually using your brackets on my 9 inch. I originally had a 4th gen f body M/C and Booster but the booster was bad. I didn't like the idea of having to mod another booster to fit so that's why I am here now.
I was thinking about trying the 81 trans am dual diaphragm booster. If my 4th gen master cylinder didn't fit it i was just gonna buy the matching master cylinder

[68sixspeed]

I have a 9" dual diaphram booster and a ~92 c4 vette master cylinder on my 68 coupe, that gave a 15/16" master cylinder and good boost on my older combo (c4 brakes back in the mid 90's, then c5 brakes in the early 2000's, now c6z06 brakes for the last 6-7 years and it still works fine) All I recall doing was opening up the mounting holes on the master cylinder a bit, adjusting the stud out on the booster, and it fit on fine.

The current project is just getting a classic industries 9" dual diaphram booster with a steel (c3?) 1" bore master cylinder. That combo might work for you too for something simple or do you want a newer master cylinder?

[corvettekid1973]

I have a 9" dual diaphram booster and a ~92 c4 vette master cylinder on my 68 coupe, that gave a 15/16" master cylinder and good boost on my older combo (c4 brakes back in the mid 90's, then c5 brakes in the early 2000's, now c6z06 brakes for the last 6-7 years and it still works fine) All I recall doing was opening up the mounting holes on the master cylinder a bit, adjusting the stud out on the booster, and it fit on fine.

The current project is just getting a classic industries 9" dual diaphram booster with a steel (c3?) 1" bore master cylinder. That combo might work for you too for something simple or do you want a newer master cylinder?

Yeah ive also read about the vette 92 masters.
I definitely want a modern master like the vette or 4th gen f body.
Im just sick of reading and not feeling sure about what part's to use.... I can't afford to buy a bunch of parts to try

[130fe]

After reading your replies you said you don't want to modify a modern car booster because you would have to modify it to install. IMO there are some systems that cutting corners (buying used parts) might not be the best option. For me, brakes is one of those systems. I just don't understand your last post saying that "Im just sick of reading and not feeling sure about what part's to use...." Some of our fellow board members (including me) have given you the info for finding a new modern 9 inch dual booster and MC. Do you know what the MC bore size is for that 81 TA MC? For the C5 style brake, the factory used a 1 inch bore in a vacuum boosted application.

Just because the MC will bolt to the booster doesn't mean they will be compatible. Please read this link- http://www.getdiscbrakes.com/knowledge-base/brakes/Brake_Drag_Prevention There are short and long rod MC and boosters. They need to match.


If they newer style combo is out of your budget, why not go with an older (and cheaper) MC/booster combo?

[corvettekid1973]

Just because the MC will bolt to the booster doesn't mean they will be compatible.

Well you kinda answer your own question lol

Im not sure what work's with what and what doesn't. You can read tons of post but still not have a confident feeling about the right parts. I don't wanna order part's from the Internet that may or may not work and end up being a hassle.

Someone suggested the Right Stuff booster which you commented that it needs a different bracket so I am nit interested in that. Then Tobin suggested the C3 boosters which I actually already had one on order at my local part's store. But I realized that they also mount totally different So once again id be modding something

Id like to find a plug and play set up that I can get from my local Orielly's. That's why I am looking at the 81 T/A booster now... it seems to be a good shot at fitting the firewall and working well with my brakes.

I was kinda aware of the different rod length deal that's why I was thinking if my 4th gen master cylinder didn't work with that booster, I could just order the matching 81 MC.

But If there isn't a easy solution I'll just have to save up and buy a nice complete aftermarket set up.

Im going to look at the link you sent.. it may be exactly what I need to learn about what the F#$%@ I'm trying to do.

[Skip Fix]

79-81 TA 1 1/8" MC small register iron, 81 TA still a 1 1/8 but since it is a "Quick Take Up" the initial portion is larger to move a little fluid quicker to overcome the "Low Drag" front calipers they started in '81-which is just a difference in the piston seal design.

[corvettekid1973]

Awesome. Thanks. They are only about $50

[Apogee]

I would run the Tuff-Stuff #2229NC (http://www.summitracing.com/parts/tff-2229nc) booster, DSE #050302 (http://www.summitracing.com/parts/dsr-050302/overview/) reduced angle firewall brackets and a 2000-era S10 disc/disc master cylinder from a right-hand drive application (ACD#18M974). I would then use a coupler nut and rated all-thread to create an adjustable pedal push rod and probably a clevis from Atech motorsports or just whip something up on the lathe/milling machine.

If you wanted a cheaper master cylinder option, then I would opt for the C3 Corvette 1" bore manual disc/disc unit (~67-76 or so) with the deep pushrod hole and a MC pushrod spacer to make up the difference for the short output rod on the booster. Given a choice, I would always run a short output rod booster since they can work with a shallow or deep MC hole with a spacer, whereas the same can't be said for a long output rod unit.

Tobin
KORE3

[Skip Fix]

The Summit Vette MC clones come with a spacer to be deep or short hole.

[redfire69]

I would run the Tuff-Stuff #2229NC (http://www.summitracing.com/parts/tff-2229nc) booster, DSE #050302 (http://www.summitracing.com/parts/dsr-050302/overview/) reduced angle firewall brackets and a 2000-era S10 disc/disc master cylinder from a right-hand drive application (ACD#18M974). I would then use a coupler nut and rated all-thread to create an adjustable pedal push rod and probably a clevis from Atech motorsports or just whip something up on the lathe/milling machine.

If you wanted a cheaper master cylinder option, then I would opt for the C3 Corvette 1" bore manual disc/disc unit (~67-76 or so) with the deep pushrod hole and a MC pushrod spacer to make up the difference for the short output rod on the booster. Given a choice, I would always run a short output rod booster since they can work with a shallow or deep MC hole with a spacer, whereas the same can't be said for a long output rod unit.

Tobin
KORE3

I'm attempting this exact tuff stuff setup above on a former manual brake 69 Camaro. It looks like I'm getting interference with the booster hard rubber boot and firewall in the last inch of trying to bolt this up. Any ideas on this issue? Do I just tighten it down, or clearance the firewall hole, or ...? Thanks in advance. Ron

[redfire69]

Well it looks like I can't just tighten it down as this will cause a preload on the brakes. Anyone run into this with this popular combination?

Edit: I got some advice to clearance the firewall hole similar to the DSE setup. Will try that soonest.