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#1 |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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power brake linkage help
I picked up a rebuilt powerbooster and new master for my '70 to convert from manual brakes to power brakes.
The power booster has a "bell crank" linkage set up. I've looked through old posts and have seen people put the linkage together from original set ups, but is there anywhere I could buy all the parts new? Since the truck is manual brakes, I have the part that connects to the brake pedal but the rod is obviously not correct. Do I need to put a WTB up or can I piece it together with new parts? I did some google searching and LMC browsing but can't find anything definitive.
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1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#2 |
Senior Member
![]() Join Date: Oct 2014
Location: New Palestine In
Posts: 931
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Re: power brake linkage help
Classic Performance Products sells the complete power brake assembly.MC, Booster, and Linkage.
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Phil "Money is only a tool to create and achieve what you want most in life" PayPal: rodnrudy@comcast.net |
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#3 |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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Re: power brake linkage help
Yes thank you. Trying to use my current set up which is just missing the linkage from the pedal to the booster
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1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#4 | |
Registered User
Join Date: Mar 2014
Location: Pekin, Illinois
Posts: 413
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Re: power brake linkage help
Quote:
These guys sell brand new ones complete https://www.speedwaymotors.com/Power...iABEgJdvvD_BwE https://www.summitracing.com/parts/s...yABEgKUwfD_BwE
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Harley 1969 Chevy C-10 Long Bed, 350cid, 700R4 Last edited by LNP; 10-03-2023 at 05:14 PM. |
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#5 |
Registered User
Join Date: Jun 2016
Location: Vancouver B.C.
Posts: 206
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Re: power brake linkage help
Can't help you with a source for one new or used, but here are the measurements from one removed from a 72 C20:
length: 9.25" center to center of holes rod diameter: 7/16" hole diameter, pedal end: 9/16" (bolt is special shouldered type) The rod length is adjustable at the pedal end. I tried to attach a pic of the parts you'd need to make one, but I can't add pics from my computer anymore? It requires a link to a web site to add pics now? |
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#6 | |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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Re: power brake linkage help
Quote:
I can use my pedal end that is on my manual set up and hopefully come up with the rest. They do sell some universal pieces that might work knowing the dimensions you gave me.
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1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#7 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: power brake linkage help
There are some universal kits you could use. Like - https://www.amazon.com/dp/B09TDD4M2Q/
The are not as good as the stock parts. You are better off if you can find a stock one. I'd post at WTB in the parts board... |
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#8 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 501
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Re: power brake linkage help
I agree that the OEM parts are beefier and have the double threads so you can turn the middle piece like a turnbuckle.
Some folks beef up the aftermarket rods by screwing more coupling nuts on. In case it wasn't mentioned(my kit said nothing), you'll want the rod at a different position on the pedal lever for Power vs manual as well. Last edited by Rust_never_sleeps; 10-02-2023 at 09:45 PM. Reason: PS --> Power(brakes not steering) |
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#9 | |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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Re: power brake linkage help
Quote:
__________________
1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#10 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 501
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Re: power brake linkage help
power brakes, NOT PS ;-)
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#11 |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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Re: power brake linkage help
Perhaps this will thread onto the rod end I already have for my manual brakes?? Not sure on overall length or if it’s fine thread or not. Have to do some investigating tomorrow.
https://www.ebay.com/itm/27449512184...emis&media=SMS
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1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#12 |
Registered User
Join Date: Jun 2016
Location: Vancouver B.C.
Posts: 206
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Re: power brake linkage help
I tried to attach a screenshot of that, but it wouldn't let me. I guess I should have just linked it.
![]() Yes, the measurements were from a bellcrank setup. My pedal only had one hole in it, I had to drill one 1" lower when I upgraded to Captain Fab's bracket. I always understood that the point of the bellcrank was to correct the geometry for power brakes using the same mounting hole as manual. Maybe I'm wrong? Not the first time... ![]() Forgot to add, I hope you also got the support brace that goes from the booster to the firewall. That whole contraption is heavy! Last edited by ratty69; 10-02-2023 at 10:47 PM. Reason: extra info |
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#13 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 501
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Re: power brake linkage help
I had assumed the same thing, seemed like an easy thing to correct the leverage in that linkage, but apparently not
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#14 |
Always on the hunt...
![]() Join Date: Sep 2006
Location: Portland, OR.
Posts: 5,604
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Re: power brake linkage help
Per your pm, here are some pictures of the OE used lower steering column to gear box intermediate shaft and p/s rag joint coupler setup that we have available/ready to ship, can combine ship everything together if interested. Mel
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***For any return/past customers & friends*** Before sending of any funds, please wait for a confirmed total and instructions for sending as our payment account info has been changed as of Jan. 2023. Thanks... |
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#15 |
Always on the hunt...
![]() Join Date: Sep 2006
Location: Portland, OR.
Posts: 5,604
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Re: power brake linkage help
j_cst_10 has passed. For anyone else needing/looking, the above pictured lower steering column to gear box intermediate shaft and p/s rag joint coupler setup has now been listed/offered in the below linked parts board f/s thread. Mel
![]() http://67-72chevytrucks.com/vboard/s...43#post9247843 .
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***For any return/past customers & friends*** Before sending of any funds, please wait for a confirmed total and instructions for sending as our payment account info has been changed as of Jan. 2023. Thanks... |
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#16 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 501
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Re: power brake linkage help
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#17 | |
Always on the hunt...
![]() Join Date: Sep 2006
Location: Portland, OR.
Posts: 5,604
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Re: power brake linkage help
Quote:
![]() ***10/04/23*** j_cst_10 has passed, these brake conversion parts have now been listed/offered in the below linked parts board f/s thread. http://67-72chevytrucks.com/vboard/s...43#post9247843 .
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***For any return/past customers & friends*** Before sending of any funds, please wait for a confirmed total and instructions for sending as our payment account info has been changed as of Jan. 2023. Thanks... Last edited by Classic Bowties; 10-05-2023 at 02:00 AM. Reason: Availability |
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#18 |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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Re: power brake linkage help
If only! I ordered the eBay link I shared above mainly out of curiosity. I’ll update everyone with pictures and measurements.
My thinking is I can use it with the pedal end from manual linkage set up. To be determined.
__________________
1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#19 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 501
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Re: power brake linkage help
I was wrong about the bell crank, Ratty69 was correct.
here's the link with the complete method to sanity check your final ratio https://shop.wilwood.com/blogs/news/...-crank-systems |
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#20 |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 590
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Re: power brake linkage help
I’ll update this thread when I get the booster installed. My eBay part that I have a link to, seems to be correct when used with the pedal end from the manual set up.
Length measurement is 9-9 1/4 with the pedal side attached and fits the bell crank end.
__________________
1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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