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#1 |
Active Member
![]() Join Date: Apr 2019
Location: Fort Lauderdale, Florida 33311
Posts: 101
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Specific brake booster for 1967 C30?
I've been battling a brake issue for the last month and we're now questioning whether the truck should have a booster or not.
It went in for an exhaust install and a wheel cylinder replacement and now we're Pines, new master, and wheel cylinders into the escapades. The shop is now suggesting a C30 needs a booster to leverage the brakes of the C30 vs that of a C10 and I'm not having a ton of luck finding a specific booster for it. It's an 283 V8, 8 lug, coil spring setup, if that matters. If anyone has some advice, I'd appreciate it to the moon. Pic of truck for discussion. Last edited by BigTopGT; 10-03-2023 at 05:30 PM. |
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#2 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: Specific brake booster for 1967 C30?
So if youre running a big block more than likely the nooster will be small but fatter to accomodate the left valve cover issue,
co traditional c-10 booster are most likely not what youre needing
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1967custom |
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#3 | |
Active Member
![]() Join Date: Apr 2019
Location: Fort Lauderdale, Florida 33311
Posts: 101
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Re: Specific brake booster for 1967 C30?
Quote:
If a c10 booster will work, that'd be a win. Last edited by BigTopGT; 10-03-2023 at 07:30 PM. |
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#4 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,737
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Re: Specific brake booster for 1967 C30?
Looks to me like it is a C-20 and not a 30. That may help your search.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#5 |
Active Member
![]() Join Date: Apr 2019
Location: Fort Lauderdale, Florida 33311
Posts: 101
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Re: Specific brake booster for 1967 C30?
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#6 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Specific brake booster for 1967 C30?
I think your shop is trying to create business for themselves. If I recall, I don't think GM mandated power brakes on 3/4 ton + until 71-ish(??) But not sure off the top of my head. Regardless - it's not a bad idea to add power brakes, but your manual brakes would and should work just fine.
But, if you opt to upgrade - these two gents sell parts that may be able to help you (make sure to let Frank (Pickmup) know your application is for a 67 C20/30): Pickmup https://67-72chevytrucks.com/vboard/...d.php?t=581862 FULL power brake system, soup to nuts Captainfab https://67-72chevytrucks.com/vboard/...d.php?t=347484 Bracket for adding a booster to a manual brake truck using off the shelf parts store boosters and parts. Both gents sell the highest quality stuff you'll find - I've purchased from both of them. |
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#7 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,166
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Re: Specific brake booster for 1967 C30?
Has the shop determined what size bore your current master cylinder is? How does it compare to the wheel cylinder bores.
It's quite possible that the master cylinder was replaced with the wrong sized bore for manual brakes? And or you have the wrong ratio for the pedal. https://grassrootsmotorsports.com/fo.../195255/page1/ https://techtalk.mpbrakes.com/how-to...<br /> master. Here is some math that may help you. https://www.motionraceworks.com/page...d-calculations I don't know what shop you have had the truck at but personally I've never had good luck with shop's when it comes to brake modifications. Most just want to swap your parts to parts they're comfortable with. Doing the research and calculations has always worked better for me. Good luck and please post your findings.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#8 | |
Active Member
![]() Join Date: Apr 2019
Location: Fort Lauderdale, Florida 33311
Posts: 101
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Re: Specific brake booster for 1967 C30?
Quote:
I'll have to see if I can find the sizes of each to compare asap. |
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#9 |
Senior Member
![]() Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,345
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Re: Specific brake booster for 1967 C30?
I'd post a pic of the SPID or VIN to answer the C20/30 question. At this point if it were me I would be considering the above soup to nuts suggestions: sounds like there is a lot of nickel and diming going on with your parts and repairs.
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DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
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#10 | |
Active Member
![]() Join Date: Apr 2019
Location: Fort Lauderdale, Florida 33311
Posts: 101
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Re: Specific brake booster for 1967 C30?
Quote:
I'll post the vin when I'm get to the truck in the morning. ![]() |
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#11 |
Registered User
![]() Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,021
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Re: Specific brake booster for 1967 C30?
coil spring setup- if rear coils its a C20, standard equipment for a C/30 was leaf springs
J70 vacuum power brakes were an option- manual brakes were standard https://www.gm.com/content/dam/compa...olet-Truck.pdf
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com Last edited by MJN; 10-05-2023 at 03:06 PM. |
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#12 |
Junior Member
![]() Join Date: Nov 2011
Location: Stratford CT
Posts: 33
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Re: Specific brake booster for 1967 C30?
I have a 67 C20 with 283 and my uncle has a 69 C30 with transplanted 350 (and massively huge Franklin camper shell). I put the same CPP booster/mc setup in both trucks several years ago (mine in 2013 and his in 2014) and both stop very well. Both trucks still have their original drum/drum brake setups. The CPP model is 6772BBD-11. Oh and my C20 is coil spring front and rear, his C30 is coil/leafs.
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Matt _____________ 1967 C20 283 CID |
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#13 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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CPP had a huge display at a large car show in KY. I was impressed at the complete packages they have for trucks and cars.
Previous Owner put a nice Hydroboost on my 67. Last edited by 1967GMCC20; 10-10-2023 at 04:48 PM. |
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