Booster ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**67sss** · 01-07-2005, 02:52 AM

How do I tell if this is for disc, drum, disc/drum, ect? Which one of the rods is the correct one to go with this booster? By the way I am going to sell this, I know someone is thinking that, but I need to have all the info before I try.
Thanks.

skokie · 01-07-2005, 02:59 AM

Looks like the top rod in the first pic is the one that goes with power brakes. Without seeing a proportioning valve I would assume that its drum drum.

wannabeburbowner · 01-07-2005, 03:16 AM

My truck has manual disc/drum. I am looking to convert it to power. Can somebody show the exact stuff that I need to do this?? If that is what I need, how much are you asking for it?? Is the proportioning valve different for power and manual??

Thanks,

Travis

**67sss** · 01-07-2005, 03:25 AM

I don't have a prop. valve with this. Wonder if you can put on the one you need...???

67ChevyRedneck · 01-07-2005, 10:00 AM

That looks like a drum/drum setup. Drum/drum master cylinders have equal reserviors front and back. A disk/drum setup will have a larger reservior near the front of the truck, front brakes, and a smaller reservior at the back, nearest the booster, for the rear brakes. A disk/drum setup will also need a proportioning valve to operate properly. Someone correct me if I'm wrong, but I believe you can interchange the boosters, delco for a delco and the other brand for one of the same, from disk to drums, all you need to do is have the proper master cylinder for your application. I'm not sure if drum/drum setups with power even had a prop. valve. Anyone know for sure???

HuggerCST · 01-07-2005, 12:03 PM

I agree, it appears to be a '67-'70 setup, & yes, my '70 with power has a prop valve. The LMC catolog shows shows 67-70 boosters, master cylinders, and prop valves all to have a different part # than '71-'72 models, but I'm not sure what the differences are. There can't be much difference though, because I have put a '70 booster on a '72 and it worked fine. Also, just an FYI, I bought a new rebuilt master cylinder for my '71 the other day from O'reilly auto parts for $12.88. Of course, I get a small discount, but I thought it was a great price.

*Tanker350* · 01-07-2005, 03:42 PM

Not to steal the thread, b/c I'm selling on too. That appears to me to be for a 67-68, b/c of the rod . Then it has to do with the mounting brackets. I don't know what kind you have. Next, is wheather it is from a 1/2 or 3/4 ton. And with that isn't it decided by the proportioning valve, b/c it proportions in 3/4tons 75% in rear drums/25% for front disc. Help me if I am wrong. And last either you have one of these boosters to make it that you have power brakes or you do not.

Does anyone know what the real difference is?

Super Duck · 01-07-2005, 11:28 PM

the boosters are the same and you can put the newer masters on them if the piston depth is the same. 73 - 87s make great doners for the prop vlv and master. even the brakes if you do it right. as far as 1/2 and 3/4 I have nothing. if you all need stuff I might be able to get to it when I get home next month.

Super Duck · 01-07-2005, 11:32 PM

oh and I agree with Tanker 350s signture. I am in the military (Air Force) and respect and hope the best for all those army guys. I hope your dad comes home safe and my prayers will be with you!

**67sss** · 01-08-2005, 07:25 PM

thanks for all the info.

Longhorn Man · 01-19-2005, 09:35 PM

drum/drum vehicles do not have a proportioning valve, but a ditributing valve. Equal pressure to all 4 wheels.
It has been said on here that the booster for drum/drum and disc/drum are interchaingable, but I was never able to make it work on the Longhorn. At one time I had a booster for a disc set up and the one that was on it was dead. I tried putting the stock master cylinder on there and it was a no go. They went together as good as teenagers and drugs.
The 3/4 ton and one ton trucks had a different booster than what is pictured, that is a 1/2 ton unit. The bigger trucks had a smaller unit that was deeper...a dual diaphram deal.

Longhorn Man · 01-19-2005, 10:04 PM

the p/n for a power master cylinder is the same as a non power master cylinder.

01-07-2005, 02:52 AM	#1
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,322	Booster ??? How do I tell if this is for disc, drum, disc/drum, ect? Which one of the rods is the correct one to go with this booster? By the way I am going to sell this, I know someone is thinking that, but I need to have all the info before I try. Thanks. Attached Images

01-07-2005, 02:59 AM	#2
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,334	Looks like the top rod in the first pic is the one that goes with power brakes. Without seeing a proportioning valve I would assume that its drum drum. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

01-07-2005, 03:16 AM	#3
wannabeburbowner Registered User Join Date: Dec 2004 Location: New Philadelphia, Ohio Posts: 253	My truck has manual disc/drum. I am looking to convert it to power. Can somebody show the exact stuff that I need to do this?? If that is what I need, how much are you asking for it?? Is the proportioning valve different for power and manual?? Thanks, Travis __________________ 71 Chevy Long Bed (gettin' bagged) 84 GMC K1500 (Sold) 85 Monte Carlo SS white w/gray int. (being a dumba** and totaled it ) 85 Monte Carlo SS clone T-top (Sold) 72 Chevelle-tubbed 64 Buick Sportwagon

01-07-2005, 10:00 AM	#5
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	That looks like a drum/drum setup. Drum/drum master cylinders have equal reserviors front and back. A disk/drum setup will have a larger reservior near the front of the truck, front brakes, and a smaller reservior at the back, nearest the booster, for the rear brakes. A disk/drum setup will also need a proportioning valve to operate properly. Someone correct me if I'm wrong, but I believe you can interchange the boosters, delco for a delco and the other brand for one of the same, from disk to drums, all you need to do is have the proper master cylinder for your application. I'm not sure if drum/drum setups with power even had a prop. valve. Anyone know for sure??? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-07-2005, 12:03 PM	#6
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	I agree, it appears to be a '67-'70 setup, & yes, my '70 with power has a prop valve. The LMC catolog shows shows 67-70 boosters, master cylinders, and prop valves all to have a different part # than '71-'72 models, but I'm not sure what the differences are. There can't be much difference though, because I have put a '70 booster on a '72 and it worked fine. Also, just an FYI, I bought a new rebuilt master cylinder for my '71 the other day from O'reilly auto parts for $12.88. Of course, I get a small discount, but I thought it was a great price. __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

01-07-2005, 03:25 AM	#4
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,322	I don't have a prop. valve with this. Wonder if you can put on the one you need...???

01-07-2005, 03:42 PM	#7
Tanker350 Account Suspended Join Date: Dec 2003 Location: Palm Desert, Ca Posts: 410	Not to steal the thread, b/c I'm selling on too. That appears to me to be for a 67-68, b/c of the rod . Then it has to do with the mounting brackets. I don't know what kind you have. Next, is wheather it is from a 1/2 or 3/4 ton. And with that isn't it decided by the proportioning valve, b/c it proportions in 3/4tons 75% in rear drums/25% for front disc. Help me if I am wrong. And last either you have one of these boosters to make it that you have power brakes or you do not. Does anyone know what the real difference is?

01-07-2005, 11:28 PM	#8
Super Duck Chevy Nuttttt Join Date: Sep 2004 Location: Santa Maria Ca. Posts: 568	the boosters are the same and you can put the newer masters on them if the piston depth is the same. 73 - 87s make great doners for the prop vlv and master. even the brakes if you do it right. as far as 1/2 and 3/4 I have nothing. if you all need stuff I might be able to get to it when I get home next month. __________________ 67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell is there anything else?

01-07-2005, 11:32 PM	#9
Super Duck Chevy Nuttttt Join Date: Sep 2004 Location: Santa Maria Ca. Posts: 568	oh and I agree with Tanker 350s signture. I am in the military (Air Force) and respect and hope the best for all those army guys. I hope your dad comes home safe and my prayers will be with you! __________________ 67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell is there anything else?

01-08-2005, 07:25 PM	#10
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,322	thanks for all the info.

01-19-2005, 09:35 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	drum/drum vehicles do not have a proportioning valve, but a ditributing valve. Equal pressure to all 4 wheels. It has been said on here that the booster for drum/drum and disc/drum are interchaingable, but I was never able to make it work on the Longhorn. At one time I had a booster for a disc set up and the one that was on it was dead. I tried putting the stock master cylinder on there and it was a no go. They went together as good as teenagers and drugs. The 3/4 ton and one ton trucks had a different booster than what is pictured, that is a 1/2 ton unit. The bigger trucks had a smaller unit that was deeper...a dual diaphram deal.

01-19-2005, 10:04 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	the p/n for a power master cylinder is the same as a non power master cylinder.



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