Aftermarket brake booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68LSS1 · 02-10-2003, 02:50 PM

I did a search and found where someone said you could use one from a Citation but is this the only option available? I'm looking to clean the firewall up. Gotta get rid of that big booster. Any aftermarket options that anybody knows of?

**Bowtie468** · 02-10-2003, 03:56 PM

Sure, you can get aftermarket boosters for your truck in i believe a 7" diameter. Someone posted a pic the other day with one purchased from GMC Paul. Just about any parts vendor ( e.g. GMC Paul,Tim Christian, Motherstruckers, Chevy Duty, etc.. ) should be able to help you with this one. Good Luck

Earl Junior · 02-10-2003, 03:59 PM

Seven inch booster from GMC Pauls.

Earl Junior · 02-10-2003, 04:01 PM

Pic #2

barn9 · 02-10-2003, 04:22 PM

Hey Earl, was that a bolt on or were there some changes involved? Just curious, I like the smaller size. By the way, that air cleaner still cracks me up, lol!

Earl Junior · 02-10-2003, 04:30 PM

It was a bolt on. The hardest part was getting the original clevis off the old push rod. Actually, getting it back in was worse. Had to hold the brake pedal to the floor with my head while holding a ratchet in one hand, an end wrench in the other and trying to get the pin back in place with my dashing good looks. My wife thought it was quite funny.

And don't laugh at my air cleaner. It barely fits under the hood, and is the shortest filament I could find. The front part is smashed all to hell because it doesn't fit well at all.

chevy_fatman · 02-10-2003, 04:47 PM

Hey Earl, I got the perfect cure for your carb (from project Copperhead)

Crank · 02-10-2003, 06:50 PM

Hey does anyone have like a *****in' Industries Air Cleaner or the web address to find one?
Brandon

Earl Junior · 02-10-2003, 07:55 PM

Quote:

Originally posted by chevy_fatman
Hey Earl, I got the perfect cure for your carb (from project Copperhead)

Those things are $350!! And I doubt they're less than 2 1/4 inches tall.

spinning wheels · 02-10-2003, 08:41 PM

Earl, is that Preditor carb that tall? I'm running a 5" tall K'nN air filter element on my SBC with a Edelbrock. I think I still have enough room for a 6" element if I could find a cheap one. Your other option would be one of the fly eye air filters. I had to run that on my Z28 for a while cause it has no hood clearance.

Snowbound · 02-11-2003, 01:01 AM

I'm LMAO at Earl. I went through the same thing when I installed my booster. The donor truck I got it off was sitting on the frame so I couldn't get the drivers door open. So I laying across the seat contorted between the 4-speed shifter and the seat, upside down with my head in about 3" of dirt, mouse crap and who knows what else, trying to get that damn thing apart.........

Putting it on my truck was a treat! Ahh the things we go through.

Brian

casey · 02-11-2003, 02:29 AM

Snowbound your a true gear head, I salute you. Hey earl junior what did that brake booster set up cost you?

Hooter · 02-11-2003, 03:56 AM

Hey Earl, What kind of carb is that?

**GMCPaul** · 02-11-2003, 07:47 AM

Earl Junior shes starting to look good under that hood!! How do you like the performance of the booster? I am assuming that predator carbed motor is running a high lift cam reducing vacuum greatly and the 7" you bought is a high performance booster designed to work on motors with as little as 16lbs vacuum with our 9" needing even less. I'd like to hear your thoughts on its performance I know mine but I like to get everyones feedback. casey you can find that booster/master cylinder assembly on this page of our site,
http://www.gmcpauls.com/Brakes&Steering.htm
GMCPaul

Earl Junior · 02-11-2003, 02:36 PM

Spinning Wheels- The Carb is 5 1/4inches tall, on top of a one inch spacer, sitting on a fairly high mounted motor. I have roughly 2 1/4 inches clearnace between hood and carb top.

Casey- The booster was about $250 bucks. And worth every penny. I also purchased the adjustable proportioning valve so I could even things out.

Hooter- That is a Predator carb with the street idle circuit. I bought it from Guitar Man here on the board. So far, I'm having a bit of trouble dialing it in where I want it. It wants to run really rich in the mid range and pretty lean on the bottom, top end performance however is dreamy. You can read more about them here.

GMC Paul- I love the new booster. It performs extremely well. I had a bit of trouble at first (soft pedal) but I think that was due to having the booster sharing a vacuum line with the PCV valve. Not having any vacuum ports on that carb has been a bit of an adventure. After I drilled and tapped a solo spot for it in my carb spacer I haven't had any issues.

The only gripe I have is that I can't hardly drive my truck anymore. I went from armstrong steering and manual drums to power steering and power disc brakes in one giant leap. I keep catching curbs on right hand turns and catching the steering wheel with my ribs on quick stops.

casey · 02-11-2003, 10:34 PM

Earl junior now you got me going on that brake set up, that proportioning valve, it sounds like you can adjust the pressure, so you can get alittle more back brakes if you want or viseversa, is it just a screw adjustment? and that brake booster is it just a direct bolt on? thanks for the info

JHickson6 · 02-11-2003, 10:48 PM

I have another question to, what's the difference between the 7" and 9" booster (besides size) are there any advantages or disadvantages of either of them?

Thanks Guys

GloryHound · 02-12-2003, 11:53 AM

Hey if you plan on changing out your existing booster let me know what you are going to do with the old one. I've got manual brakes right now and have wanted to upgrade. I'm not really worried about cluttering up my firewall. After all nobody can see it when I'm passing them!

But they will see it if I can not stop before I hit something!

Blue68 · 02-12-2003, 02:56 PM

The difference between a 7" (38.5 cu.inches) and 9" (63.6 cu.inches) is about 25 cubic inches of surface area on the diaphram. These means one of two things. With equal engine vacuum greater pressure (less foot pressure) applied by the booster, or equal pressure with less vacuum on a bigger booster.

Earl Junior · 02-12-2003, 07:37 PM

Casey- It was a direct bolt on. The studs should already be in your firewall for the mounting bracket. Everything Blue68 said about the size of the diaphragm is correct. The adjustable proportioning valve is exactly what you said: adjusts more or less pressure to rear brakes. The one GMC Pauls sells is made by Wilwood, but engraved with McGaugheys' logo.

casey · 02-12-2003, 10:45 PM

thanks earl junior

02-10-2003, 02:50 PM	#1
68LSS1 Registered User Join Date: Dec 2002 Location: Tampa Posts: 1,191	Aftermarket brake booster I did a search and found where someone said you could use one from a Citation but is this the only option available? I'm looking to clean the firewall up. Gotta get rid of that big booster. Any aftermarket options that anybody knows of?

02-10-2003, 03:59 PM	#3
Earl Junior Cadillac power Join Date: Oct 2002 Location: North Idaho Posts: 296	Seven inch booster from GMC Pauls. Attached Images __________________ Just for the record, if I'm down to my last potato, I'm not sharing it with a guy who wants to kill me so he can get a better supply of virgins in paradise. That lesson is a little thing I call Economics 101, infidel style. --Scott Adams author of Dilbert

02-10-2003, 04:01 PM	#4
Earl Junior Cadillac power Join Date: Oct 2002 Location: North Idaho Posts: 296	Pic #2 Attached Images __________________ Just for the record, if I'm down to my last potato, I'm not sharing it with a guy who wants to kill me so he can get a better supply of virgins in paradise. That lesson is a little thing I call Economics 101, infidel style. --Scott Adams author of Dilbert

02-10-2003, 04:22 PM	#5
barn9 Half a bubble off! Join Date: Jun 2000 Location: Winfield, Ks, USA Posts: 5,588	Hey Earl, was that a bolt on or were there some changes involved? Just curious, I like the smaller size. By the way, that air cleaner still cracks me up, lol! __________________ Just call me LB. '71 Cheyenne, 402BB, hauls blondes, brunettes, or redheads.

02-10-2003, 04:30 PM	#6
Earl Junior Cadillac power Join Date: Oct 2002 Location: North Idaho Posts: 296	It was a bolt on. The hardest part was getting the original clevis off the old push rod. Actually, getting it back in was worse. Had to hold the brake pedal to the floor with my head while holding a ratchet in one hand, an end wrench in the other and trying to get the pin back in place with my dashing good looks. My wife thought it was quite funny. And don't laugh at my air cleaner. It barely fits under the hood, and is the shortest filament I could find. The front part is smashed all to hell because it doesn't fit well at all. __________________ Just for the record, if I'm down to my last potato, I'm not sharing it with a guy who wants to kill me so he can get a better supply of virgins in paradise. That lesson is a little thing I call Economics 101, infidel style. --Scott Adams author of Dilbert

02-10-2003, 03:56 PM	#2
Bowtie468 Senior Member Join Date: Jun 2002 Location: Cecilia, Louisiana Posts: 1,638	Sure, you can get aftermarket boosters for your truck in i believe a 7" diameter. Someone posted a pic the other day with one purchased from GMC Paul. Just about any parts vendor ( e.g. GMC Paul,Tim Christian, Motherstruckers, Chevy Duty, etc.. ) should be able to help you with this one. Good Luck __________________ Chris click here to see my buildpage http://67-72chevytrucks.com/vboard/s...d.php?t=394656 ---------------------------------- 1979 C10 Silverado Big10 SWB Factory 454/400 Cardinal Red/Santa Fe Tan (original paint) 1969 Camaro X44 LS swap 1968 C10 SWB Fleetside (SOLD) 468BBC MultiPort TPI / Dynamic EFI P4 Black/Black 1963 Nova SS convertible (SOLD) 194 I6/ PowerGlide

02-10-2003, 04:47 PM	#7
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,621	Hey Earl, I got the perfect cure for your carb (from project Copperhead) Attached Images __________________ Paul How do you make the invisible, visible?.........You take it away. Last edited by chevy_fatman; 02-10-2003 at 07:09 PM.

02-10-2003, 06:50 PM	#8
Crank Registered User Join Date: Aug 2002 Location: Crittenden, KY Posts: 1,964	Hey does anyone have like a *****in' Industries Air Cleaner or the web address to find one? Brandon

02-10-2003, 08:41 PM	#10
spinning wheels Registered User Join Date: Sep 2001 Location: Hacienda Heights, California USA Posts: 474	Earl, is that Preditor carb that tall? I'm running a 5" tall K'nN air filter element on my SBC with a Edelbrock. I think I still have enough room for a 6" element if I could find a cheap one. Your other option would be one of the fly eye air filters. I had to run that on my Z28 for a while cause it has no hood clearance. __________________ '72 GMC custom camper 350/350

02-11-2003, 01:01 AM	#11
Snowbound Registered User Join Date: Aug 2002 Location: Westbank, BC Posts: 401	I'm LMAO at Earl. I went through the same thing when I installed my booster. The donor truck I got it off was sitting on the frame so I couldn't get the drivers door open. So I laying across the seat contorted between the 4-speed shifter and the seat, upside down with my head in about 3" of dirt, mouse crap and who knows what else, trying to get that damn thing apart......... Putting it on my truck was a treat! Ahh the things we go through. Brian __________________ 1965 Chevy Short Box Stepside, 230 - 3 speed, 4:11 gears, original paint rust free survivor. Now sporting a 383 SBC and TKO-600

02-11-2003, 02:29 AM	#12
casey Registered User Join Date: Jan 2003 Location: Kelowna B.C. Canada Posts: 2,048	Snowbound your a true gear head, I salute you. Hey earl junior what did that brake booster set up cost you?

02-11-2003, 03:56 AM	#13
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,083	Hey Earl, What kind of carb is that? __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

02-11-2003, 07:47 AM	#14
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,718	Earl Junior shes starting to look good under that hood!! How do you like the performance of the booster? I am assuming that predator carbed motor is running a high lift cam reducing vacuum greatly and the 7" you bought is a high performance booster designed to work on motors with as little as 16lbs vacuum with our 9" needing even less. I'd like to hear your thoughts on its performance I know mine but I like to get everyones feedback. casey you can find that booster/master cylinder assembly on this page of our site, http://www.gmcpauls.com/Brakes&Steering.htm GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

02-11-2003, 02:36 PM	#15
Earl Junior Cadillac power Join Date: Oct 2002 Location: North Idaho Posts: 296	Spinning Wheels- The Carb is 5 1/4inches tall, on top of a one inch spacer, sitting on a fairly high mounted motor. I have roughly 2 1/4 inches clearnace between hood and carb top. Casey- The booster was about $250 bucks. And worth every penny. I also purchased the adjustable proportioning valve so I could even things out. Hooter- That is a Predator carb with the street idle circuit. I bought it from Guitar Man here on the board. So far, I'm having a bit of trouble dialing it in where I want it. It wants to run really rich in the mid range and pretty lean on the bottom, top end performance however is dreamy. You can read more about them here. GMC Paul- I love the new booster. It performs extremely well. I had a bit of trouble at first (soft pedal) but I think that was due to having the booster sharing a vacuum line with the PCV valve. Not having any vacuum ports on that carb has been a bit of an adventure. After I drilled and tapped a solo spot for it in my carb spacer I haven't had any issues. The only gripe I have is that I can't hardly drive my truck anymore. I went from armstrong steering and manual drums to power steering and power disc brakes in one giant leap. I keep catching curbs on right hand turns and catching the steering wheel with my ribs on quick stops. __________________ Just for the record, if I'm down to my last potato, I'm not sharing it with a guy who wants to kill me so he can get a better supply of virgins in paradise. That lesson is a little thing I call Economics 101, infidel style. --Scott Adams author of Dilbert

02-11-2003, 10:34 PM	#16
casey Registered User Join Date: Jan 2003 Location: Kelowna B.C. Canada Posts: 2,048	Earl junior now you got me going on that brake set up, that proportioning valve, it sounds like you can adjust the pressure, so you can get alittle more back brakes if you want or viseversa, is it just a screw adjustment? and that brake booster is it just a direct bolt on? thanks for the info



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02-11-2003, 10:48 PM	#17
JHickson6 I Love This Stuff! Join Date: May 2002 Location: Winnipeg, Manitoba, Canada Posts: 739	I have another question to, what's the difference between the 7" and 9" booster (besides size) are there any advantages or disadvantages of either of them? Thanks Guys __________________ My Rides 1967 C10 In Pieces for now 1985 Ford B700 SourPuss Bus - BIG BLUE 2003 Silverado CITY WORKER YELLOW!!

02-12-2003, 11:53 AM	#18
GloryHound Working on a Nova. Join Date: Nov 2002 Location: ## Posts: 506	Hey if you plan on changing out your existing booster let me know what you are going to do with the old one. I've got manual brakes right now and have wanted to upgrade. I'm not really worried about cluttering up my firewall. After all nobody can see it when I'm passing them! But they will see it if I can not stop before I hit something!

02-12-2003, 02:56 PM	#19
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	The difference between a 7" (38.5 cu.inches) and 9" (63.6 cu.inches) is about 25 cubic inches of surface area on the diaphram. These means one of two things. With equal engine vacuum greater pressure (less foot pressure) applied by the booster, or equal pressure with less vacuum on a bigger booster. __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.

02-12-2003, 07:37 PM	#20
Earl Junior Cadillac power Join Date: Oct 2002 Location: North Idaho Posts: 296	Casey- It was a direct bolt on. The studs should already be in your firewall for the mounting bracket. Everything Blue68 said about the size of the diaphragm is correct. The adjustable proportioning valve is exactly what you said: adjusts more or less pressure to rear brakes. The one GMC Pauls sells is made by Wilwood, but engraved with McGaugheys' logo. __________________ Just for the record, if I'm down to my last potato, I'm not sharing it with a guy who wants to kill me so he can get a better supply of virgins in paradise. That lesson is a little thing I call Economics 101, infidel style. --Scott Adams author of Dilbert

02-12-2003, 10:45 PM	#21
casey Registered User Join Date: Jan 2003 Location: Kelowna B.C. Canada Posts: 2,048	thanks earl junior

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