How this thing is gonna work? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nima · 06-07-2006, 11:55 PM

Well, I thought I can just bolt up a 71-72 MC to my 67 power booster(for front disc conversion) but they seem very different. What is the solution? I appreciate any inputs.

shelby987 · 06-08-2006, 08:15 AM

I guess I am not completely sure what differences you are referring to. The volume of the MC will be large to accomodate the extra fluid required to run disc. brakes. The mounting flange appears different, but I am sure the bolt spacing is the same, so it should bolt up.
It looks like the indentation in the rear of the MC might be a little deeper on your drum/drum MC, but you should be able to adjust for that by lengthening the brake rod (right?)

**truckdude239** · 06-08-2006, 08:45 AM

ou might have to change the brake booster there where two different types of brake boosters maded by different compnaies

67ChevyRedneck · 06-08-2006, 09:19 AM

Your 67 originally had drum brakes and a drum brake MS with or without a booster will have a MC that has two equal sized reserviors to send equal amounts of fluid to the front and rear brake systems. Now that you have disk brakes the MS will have a smaller reservior for the rear brakes and a larger one for the fronts. Pop the tops on the MC's and you'll see what I mean. I'm not sure if the MC will bolt up and work with a 67 booster, you may have to purchase a 71/72 style booster??? What I do know is that you should also have a proportioning valve for your brakes to work properly

Hope I've helped more than cofused!

I just saw in your sig that you have a 3/4 ton 8 lug truck.... that may be a whole different beast all together. Someone who knows more will hopefully speak up, but I think with a 3/4 ton the boosters are different and the MC's reserviors or the prop valve are reversed or something funky like that???

67ChevyRedneck · 06-08-2006, 09:27 AM

Read this thread, especially post number 14:

http://67-72chevytrucks.com/vboard/s...aster+cylinder

Nima · 06-08-2006, 10:45 AM

Thanks guys. Hum, then I have to return the 67 booster that I bought. My undrestanding was that I just need to change the MC. Well, now another question, the rod behind 67 booster is shorter that the rod on 71/2 booster. I mean the rod which connect to brake assembly on the firewall. How can I modify that? I wish I had a picture but I am at work right now. Another question, Now that I have to change the booster and make some modifications, is there any advantage to go to later model booster and mc? I mean performancewise and pricewise? Thanks again for all the helps./

Nima · 06-08-2006, 10:53 AM

I forgot to mention! When I said the two mc are different I didn't mena the size or mounting bolts I meant the flange , my bad wording. The rod from booster seems to be too big to sit in the new mc (this might sound stupid to you but don't forget I am fist timmer) I didn't know if I should just force it in

bbut I thought it is better to ask. Thanks again

shelby987 · 06-08-2006, 11:51 AM

sounds like you may need to look for a 69? and up setup.
In terms of performance vs. cost of new and old. I swapped a 3/4t booster on my 70 4x4 with drums all around.....it made a WORLD of difference, I would have stuck with the drums I was so pleased, but unfortunately I had an accident and my "one year only axle" could not be repaired. The only major difference I see is space, I run an I6, with a 4bbl....and that booster takes up a LOT of my underhood clearance around the carb....if you have the space, older parts work just fine.

Americanrider · 06-08-2006, 12:15 PM

Quote:

Originally Posted by truckdude239

ou might have to change the brake booster there where two different types of brake boosters made by different compnaies

Delco-Morraine and Bendix are the two companies that made these booster & MC setups. I've been told (more than once) that the two will not interchange. Need to match Delco MC with Delco boosters.

For my 67 K20 [non-power drums] I found a Delco booster & rod from a 72 K20, bought a rebuilt MC to match from NAPA and everything bolted right up.

06-07-2006, 11:55 PM	#1
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	How this thing is gonna work? Well, I thought I can just bolt up a 71-72 MC to my 67 power booster(for front disc conversion) but they seem very different. What is the solution? I appreciate any inputs. Attached Images __________________ 1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner

06-08-2006, 08:15 AM	#2
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	Re: How this thing is gona work? I guess I am not completely sure what differences you are referring to. The volume of the MC will be large to accomodate the extra fluid required to run disc. brakes. The mounting flange appears different, but I am sure the bolt spacing is the same, so it should bolt up. It looks like the indentation in the rear of the MC might be a little deeper on your drum/drum MC, but you should be able to adjust for that by lengthening the brake rod (right?) __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!

06-08-2006, 08:45 AM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,236	Re: How this thing is gona work? ou might have to change the brake booster there where two different types of brake boosters maded by different compnaies __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-08-2006, 09:19 AM	#4
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: How this thing is gona work? Your 67 originally had drum brakes and a drum brake MS with or without a booster will have a MC that has two equal sized reserviors to send equal amounts of fluid to the front and rear brake systems. Now that you have disk brakes the MS will have a smaller reservior for the rear brakes and a larger one for the fronts. Pop the tops on the MC's and you'll see what I mean. I'm not sure if the MC will bolt up and work with a 67 booster, you may have to purchase a 71/72 style booster??? What I do know is that you should also have a proportioning valve for your brakes to work properly Hope I've helped more than cofused! I just saw in your sig that you have a 3/4 ton 8 lug truck.... that may be a whole different beast all together. Someone who knows more will hopefully speak up, but I think with a 3/4 ton the boosters are different and the MC's reserviors or the prop valve are reversed or something funky like that??? __________________ 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! Last edited by 67ChevyRedneck; 06-08-2006 at 09:22 AM.

06-08-2006, 09:27 AM	#5
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: How this thing is gona work? Read this thread, especially post number 14: http://67-72chevytrucks.com/vboard/s...aster+cylinder __________________ 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!

06-08-2006, 10:45 AM	#6
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Re: How this thing is gona work? Thanks guys. Hum, then I have to return the 67 booster that I bought. My undrestanding was that I just need to change the MC. Well, now another question, the rod behind 67 booster is shorter that the rod on 71/2 booster. I mean the rod which connect to brake assembly on the firewall. How can I modify that? I wish I had a picture but I am at work right now. Another question, Now that I have to change the booster and make some modifications, is there any advantage to go to later model booster and mc? I mean performancewise and pricewise? Thanks again for all the helps./ __________________ 1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner

06-08-2006, 10:53 AM	#7
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Re: How this thing is gona work? I forgot to mention! When I said the two mc are different I didn't mena the size or mounting bolts I meant the flange , my bad wording. The rod from booster seems to be too big to sit in the new mc (this might sound stupid to you but don't forget I am fist timmer) I didn't know if I should just force it in bbut I thought it is better to ask. Thanks again __________________ 1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner

06-08-2006, 11:51 AM	#8
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	Re: How this thing is gona work? sounds like you may need to look for a 69? and up setup. In terms of performance vs. cost of new and old. I swapped a 3/4t booster on my 70 4x4 with drums all around.....it made a WORLD of difference, I would have stuck with the drums I was so pleased, but unfortunately I had an accident and my "one year only axle" could not be repaired. The only major difference I see is space, I run an I6, with a 4bbl....and that booster takes up a LOT of my underhood clearance around the carb....if you have the space, older parts work just fine. __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!



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