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#1 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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So, I thought I had dotted all my Ts and I CERTAINLY crossed my Is... Got a used setup off a 72 booster + bracket + mc + pedal rod.
That pedal rod seems too short. I know I've seen a thread that had someone using a female hex -> male threaded stud extension on that rod but i can't find it through search for the life of me.... (If you guys find it OR know off hand what the thread size is I can pick one up @ work) I had it all hooked up and the brake pedal was noticeably lower than both gas and clutch pedals. Also, at rest it drags the linkage so that its touching the firewall, and i don't think that is the way its supposed to be. (307, 3-on-the-tree) One more question, on the back of the booster itself, there is a boot that covers a plastic cylinder that surrounds the push rod. The boot is well.... old and busted, and i can see a crack in the plastic cylinder. Do I need a new brake booster? ![]() Thanks in advance. ~Dan |
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#2 |
Registered User
Join Date: Mar 2010
Location: Rogersville, MO
Posts: 33
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Re: Power Brake converison '71
i have been looking for the same thread for a week now. i believe it had pics of rod also but i can not find it. if some one has the length maybe i can make one a pic would help to
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#3 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,436
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Re: Power Brake converison '71
Here is a picture that teeitup posted from a '71 that he is parting out.
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'67 GMC 2500, 292, 4spd, AC |
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#4 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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Re: Power Brake converison '71
Doesn't do too much for us, but thanks for the pic. (Actually it helps on the other bracketry, thanks!)
Though... my booster isn't as round.... Maybe I'll go snag a couple different lengths from the hardware store and see what i come up with. Until then, hopefully someone can dig up that fossilized thread for the both of us. |
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#5 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: Power Brake converison '71
thats funny I bought a booster from him and it was bad I have been waiting for him to get another??
anyway As far as the rod goes you need to use the one with the booster not your old one I ran into the same issue..also make sure you check your brake light switch for adjustment when your done.... there is no real check for a booster.....its hit or miss its nothing but a big rubber diafram if it leaks then your brakes will be hard..they will still work but very hard..
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1970 C10 CST fleetside 472 ....big dreams little cash... SunShine Syndicate.. ![]() Mikes Sandwich Fair Run OCT 8th 2011
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#6 |
Registered User
Join Date: Mar 2010
Location: Rogersville, MO
Posts: 33
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Re: Power Brake converison '71
any idea of a company that sells the pedal to booster rod?
Last edited by hddavis; 07-16-2010 at 02:26 AM. |
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#7 |
"THE GREEN GOBLIN"
Join Date: Mar 2008
Location: Fremont Ca.
Posts: 1,025
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Re: Power Brake converison '71
I did this upgrade to my truck 72chevy and well you have to use the new rod that came from the power brakes set up because the rod on the non power set up doesn't work, and it should all bolt right up with no problem.
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![]() "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi ![]() Drive it like you stole it! ![]() Petey-pablo@sbcglobal.net |
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#8 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: Power Brake converison '71
who ever you bought the set up from???? or your going to have find used...I'm not sure if any of the new models fit??
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1970 C10 CST fleetside 472 ....big dreams little cash... SunShine Syndicate.. ![]() Mikes Sandwich Fair Run OCT 8th 2011
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#9 |
I miss this truck.
Join Date: Dec 2001
Location: Lexington, KY U.S.A.
Posts: 2,863
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Re: Power Brake converison '71
If I remember correctly from converting mine, nobody reproduces this part. Used is your only option. I got lucky and a local member, Huck, found one at a salvage yard for me a couple days after I posted a WTB on here.
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'07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT. |
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#10 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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Re: Power Brake converison '71
I used the one that came with the used setup i bought, perhaps i was given the wrong one... hmm....
In regards to my other question, I'll take a pic when i get home, if the little woman doesn't have me running in circles again... |
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#11 |
I miss this truck.
Join Date: Dec 2001
Location: Lexington, KY U.S.A.
Posts: 2,863
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Re: Power Brake converison '71
As far as I remember, the only difference between the power and the manual pushrods, is the eye on one end to attached to the pivot that applies pressure to the Booster pushrod. The length SHOULD be adjustable. Can you lengthen the rod enough to get your pedal to a functional height?
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'07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT. |
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#13 |
Registered User
Join Date: Feb 2010
Location: Rexburg Idaho
Posts: 37
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Re: Power Brake converison '71
This might help probably not, but I got one off a 79 pickup, and installed it. I needed to make the rod 2 inches longer, and never have had a problem.
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#14 |
Active Member
![]() Join Date: Jun 2002
Location: L.A. Lower Alabama
Posts: 453
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Re: Power Brake converison '71
Here's a link where you can get 7/16-20 threaded rod, they also have it in stainless for more$
http://www.use-enco.com/CGI/INPDFF?PMPAGE=780&PMCTLG=00 oil finish low carbon steel http://www.use-enco.com/CGI/INPDFF?PMPAGE=778&PMCTLG=00 stainless and 7/16-20 coupling nut http://www.boltdepot.com/product.aspx?cc=7&cs=181&cm=6
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1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin Last edited by Zeke; 07-18-2010 at 08:43 AM. |
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#15 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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Re: Power Brake converison '71
Alright, I had one of the guys @ work weld a nut to the back of a 7/16-20 bolt, little redneck, but cheap & easy. Now, @ rest against the pedal stop (plate bolted to underside of dash) i can get the pin in & out, is this where its supposed to sit with no outside pressures on it? Can anyone snap a quick pic of an in-use pb on their trucks?
and heres the pic for my last question: Does this mean i need a new booster? ![]() Last edited by DjS71; 07-19-2010 at 10:35 PM. Reason: added pic |
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#16 | |
I miss this truck.
Join Date: Dec 2001
Location: Lexington, KY U.S.A.
Posts: 2,863
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Re: Power Brake converison '71
Quote:
Now tighten everything down, and see if your brake lights go out. If not, you'll need to adjust the brake light switch down to the pedal. And just because they are out now, doesn't mean they are going to go out when you press the pedal and let it return naturally. I went through a period after I installed mine where I had to pull up with my toe to get the lights to go out, until I got a chance to get back under the dash and adjust that switch. I think so, but I'm no expert.
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'07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT. |
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#17 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: Power Brake converison '71
heres what mine looked like before the install you can see what the rod looks like...like I said before I'm looking for another booster.. put that one in and see if it works ?? if so great if not then lok for another and you'll have to deal with the hard pedal till you swap it
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1970 C10 CST fleetside 472 ....big dreams little cash... SunShine Syndicate.. ![]() Mikes Sandwich Fair Run OCT 8th 2011
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#18 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,436
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Re: Power Brake converison '71
djs71, that booster is from a van.
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'67 GMC 2500, 292, 4spd, AC Last edited by RichardJ; 07-20-2010 at 11:28 AM. |
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#19 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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Re: Power Brake converison '71
Mine or Hottrucks? Also, does that make things difficult?
EDIT: Clever editing skills, RichardJ. Last edited by DjS71; 07-20-2010 at 01:51 PM. |
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#20 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: Power Brake converison '71
that maybe why your peddle rod is funky??? Mine came from a PU I think like I said it came from a board memeber
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1970 C10 CST fleetside 472 ....big dreams little cash... SunShine Syndicate.. ![]() Mikes Sandwich Fair Run OCT 8th 2011
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#21 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Power Brake converison '71
no one has mentioned that you have to install the pushrod on the other hole in the pedal arm.
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#22 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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Re: Power Brake converison '71
There is only one free hole in my pedal arm. (2 technically but the upper one is the pivot point)
I'll bolt it all back up and break out the vacuum pump and see what happens with the booster. |
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#23 |
Registered User
Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
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Re: Power Brake converison '71
Put Vacuum to 'er and No dice.
Whilst I ponder what to do with that, I tried to get the pipe plug out of the manifold behind the carb so that when I get a new one, the vacuum line is already run. Stuck solid. While I'm in there I look down at the alternator bracket and see a whole mess of washers behind it. I assume this isn't standard operating procedure? Bring on the snowball. |
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