Auto shift linkage in way of power brake booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

calvinator · 06-06-2008, 06:45 PM

I am in the midst of changing my '70 to power disc brakes and it seems that the power brake booster will not mount against my firewall because my shift linkage on my steering column is in the way. I am using (or trying to) a brake booster from my parts truck, an 84 gmc half ton. Those of you that have a power booster on your automatic half tons, what did you do about this problem? Did you find a booster that fits? Thanks in advance.

neonlarry · 06-06-2008, 06:57 PM

67-72 boosters mount on a bracket away from the firewall.

calvinator · 06-06-2008, 08:25 PM

well my brake booster from the 84 also has a bracket thats about 3.5" deep. so the booster is about 3.5" away from the firewall if/when properly mounted. but still the bottom of the booster hits the shifter linkage when its in 'park'

**steelhorse** · 06-06-2008, 09:47 PM

Do a search for this there is a previous thread on this(I dont know how to do a link)You have to trim the bracket some.

Sport/Truck · 07-11-2008, 08:36 AM

Quote:

Originally Posted by steelhorse

Do a search for this there is a previous thread on this(I dont know how to do a link)You have to trim the bracket some.

I don't find one....
s/t

dan42 · 06-06-2008, 11:16 PM

A picture might be helpful for us to figure it out with you -

Longhorn Man · 06-07-2008, 07:00 PM

personally, I'd just get the right parts.

calvinator · 06-08-2008, 12:59 PM

Quote:

Originally Posted by Longhorn Man

personally, I'd just get the right parts.

the right parts... meaning a different (and smaller) brake booster? I found an old thread about a guy who cut a small slit into the metal piece which the rod connects to, and then he just bent that piece a little bit out of the way.

Pont406 · 06-08-2008, 02:10 PM

Maybe this will help. My 69 came with a booster. Plenty of clearence. Sounds like you don't have a right set up.

chevy72blu · 06-08-2008, 02:50 PM

Quote:

Originally Posted by Pont406

Maybe this will help. My 69 came with a booster. Plenty of clearence. Sounds like you don't have a right set up.

Or, you may be able to use the Lokar universal kit like in this picture. I swapped mine over to it before going with a cable shifter. I liked the lokar rod much better; you can easilly adjust it so that your column indicator lines up perfectly and make it either firmer or softer switching between gears. Mostly, its a lot less bulky and might clear your booster.

calvinator · 06-08-2008, 05:20 PM

Tomorrow Ill try to get a picture that illistrate the problem. But it looks like Ill have to buy a different shaped booster.

Gray Ghost · 06-08-2008, 05:55 PM

My 70 has that same bracket...the later model brackets won't work.

Ford Assassin · 07-11-2008, 12:54 AM

Quote:

Originally Posted by Gray Ghost

My 70 has that same bracket...the later model brackets won't work.

Look here:

http://67-72chevytrucks.com/vboard/s...d.php?t=215980

Gray Ghost · 07-11-2008, 06:41 AM

Guess I shoulda said 'without mods'. I suppose most any bracket can be made to work. I do like the look of a master cylinder that isn't at an angle like the stock bracket.

Sport/Truck · 07-11-2008, 08:35 AM

Quote:

Originally Posted by Ford Assassin

Look here:

http://67-72chevytrucks.com/vboard/s...d.php?t=215980

That FAQ is very vague and should contain more detail. Like it won't work with auto linkage.
s/t

**70C10Toejam** · 06-08-2008, 05:24 PM

Think this is what you are looking for.

http://67-72chevytrucks.com/vboard/s...d.php?t=238199

I know there are some threads that show cutting and welding the bracket to get it to fit, but couldn't find it.

Ford Assassin · 07-11-2008, 04:15 PM

I still think I will attempt it. I want shorten my steering column anyway for alittle more room, then I'll see if it will still work or not and post my results.

Sport/Truck · 07-11-2008, 04:32 PM

Quote:

Originally Posted by Ford Assassin

I still think I will attempt it. I want shorten my steering column anyway for alittle more room, then I'll see if it will still work or not and post my results.

Where here to help, call if you have questions!.

s/t

airdale94 · 07-11-2008, 04:23 PM

The 67-72's have a bellcrank that the pedal pushes on then the bellcrank rod pushes the booster/mc. the mod where you trim the bracket corner is for 3/4 tons. In my opinion on a 1/2 ton you would be better off getting the settup off a 67-72 half ton.

Sport/Truck · 07-11-2008, 04:31 PM

Quote:

Originally Posted by airdale94

The 67-72's have a bellcrank that the pedal pushes on then the bellcrank rod pushes the booster/mc. the mod where you trim the bracket corner is for 3/4 tons. In my opinion on a 1/2 ton you would be better off getting the settup off a 67-72 half ton.

That mod is for all 73-78 boosters.
I, like others don't like how far the original sticks out, and looking for something cleaner looking.

s/t

Ford Assassin · 07-11-2008, 04:35 PM

Quote:

Originally Posted by airdale94

The 67-72's have a bellcrank that the pedal pushes on then the bellcrank rod pushes the booster/mc. the mod where you trim the bracket corner is for 3/4 tons. In my opinion on a 1/2 ton you would be better off getting the settup off a 67-72 half ton.

Yeah hear what you are saying, but I totally HATE the look of the stock booster setup for the '67-'72. I'd rather keep my manual brakes or switch to a floor shifter before I ran the stock booster setup.

Besides, I already have a brand new booster for a '73-'87. No sense on spending money twice.

Quote:

Originally Posted by Sport/Truck

That mod is for all 73-78 boosters.
I, like others don't like how far the original sticks out, and looking for something cleaner looking.

s/t

Agreed.

neonlarry · 07-11-2008, 08:13 PM

How about a hydroboost?
http://67-72chevytrucks.com/vboard/s...d.php?t=175714

Sport/Truck · 07-11-2008, 08:35 PM

I think there too bulky. Plus all the extra lines that need to be run to the PS pump.
I'm convinced myself to go with a powermaster.
s/t

Ford Assassin · 07-11-2008, 08:41 PM

Quote:

Originally Posted by Sport/Truck

I think there too bulky. Plus all the extra lines that need to be run to the PS pump.

Agreed, Plus I already have my booster.

**Boog** · 07-11-2008, 08:45 PM

I'm with Larry in that I was just thinking of hydroboost as an alternative in this situation but I realize the OP already has a unit he wishes to use. I believe there are only two hydro lines to run from the power steering pump to the hydroboost. They work very well and are a smaller diameter package than the conventional vacumn boosters. More clearance for a big block.
If the OP is set on using the 73 up assembly he may be able to heat and bend the shifting linkage to gain some clearance. Or trade his unit for the corrrect one for his truck.

06-06-2008, 06:45 PM	#1
calvinator Registered User Join Date: Mar 2008 Location: Winnipeg, Canada Posts: 52	Auto shift linkage in way of power brake booster I am in the midst of changing my '70 to power disc brakes and it seems that the power brake booster will not mount against my firewall because my shift linkage on my steering column is in the way. I am using (or trying to) a brake booster from my parts truck, an 84 gmc half ton. Those of you that have a power booster on your automatic half tons, what did you do about this problem? Did you find a booster that fits? Thanks in advance.

06-06-2008, 06:57 PM	#2
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Auto shift linkage in way of power brake booster 67-72 boosters mount on a bracket away from the firewall. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

06-06-2008, 08:25 PM	#3
calvinator Registered User Join Date: Mar 2008 Location: Winnipeg, Canada Posts: 52	Re: Auto shift linkage in way of power brake booster well my brake booster from the 84 also has a bracket thats about 3.5" deep. so the booster is about 3.5" away from the firewall if/when properly mounted. but still the bottom of the booster hits the shifter linkage when its in 'park'

06-06-2008, 09:47 PM	#4
steelhorse Senior Member Join Date: Apr 2008 Location: Franklinton NC Posts: 1,309	Re: Auto shift linkage in way of power brake booster Do a search for this there is a previous thread on this(I dont know how to do a link)You have to trim the bracket some.

06-06-2008, 11:16 PM	#6
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: Auto shift linkage in way of power brake booster A picture might be helpful for us to figure it out with you - __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

06-07-2008, 07:00 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Auto shift linkage in way of power brake booster personally, I'd just get the right parts.

06-08-2008, 02:10 PM	#9
Pont406 Registered User Join Date: Aug 2007 Location: West Hills, California Posts: 679	Re: Auto shift linkage in way of power brake booster Maybe this will help. My 69 came with a booster. Plenty of clearence. Sounds like you don't have a right set up. Attached Images

06-08-2008, 05:20 PM	#11
calvinator Registered User Join Date: Mar 2008 Location: Winnipeg, Canada Posts: 52	Re: Auto shift linkage in way of power brake booster Tomorrow Ill try to get a picture that illistrate the problem. But it looks like Ill have to buy a different shaped booster.

06-08-2008, 05:55 PM	#12
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: Auto shift linkage in way of power brake booster My 70 has that same bracket...the later model brackets won't work. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

07-11-2008, 06:41 AM	#14
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: Auto shift linkage in way of power brake booster Guess I shoulda said 'without mods'. I suppose most any bracket can be made to work. I do like the look of a master cylinder that isn't at an angle like the stock bracket. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

06-08-2008, 05:24 PM	#16
70C10Toejam Hellasick Join Date: Jul 2006 Location: Death Moans, IA Posts: 876	Re: Auto shift linkage in way of power brake booster Think this is what you are looking for. http://67-72chevytrucks.com/vboard/s...d.php?t=238199 I know there are some threads that show cutting and welding the bracket to get it to fit, but couldn't find it. __________________ I keep two MAGNUMS in my desk. One's a gun, and I keep it loaded. The other's a bottle and it keeps ME loaded. I'm Tracer Bullet. (Calvin and Hobbes) This life was a test. It was only a test. If this had been an actual life, you would have received instructions on where to go and what to do. RED meat is not bad for you...FUZZY BLUE/GREEN MEAT is bad for you!!!!!!!!!!!!! BUILT FORD TOUGH WITH CHEVY STUFF--sticker at Goodguys Last edited by 70C10Toejam; 06-08-2008 at 06:34 PM.

07-11-2008, 04:15 PM	#17
Ford Assassin Registered User Join Date: Jun 2008 Location: Jackson, Ca. Posts: 674	Re: Auto shift linkage in way of power brake booster I still think I will attempt it. I want shorten my steering column anyway for alittle more room, then I'll see if it will still work or not and post my results. __________________ Cable -K5 Blazer 2wd: 6.0 LQ4, 7875 Turbo, Tick Stage II Turbo Cam, Built 4L80e, RevMax Billet 3600, 9.5" 14 Bolt -Chevy 3+3 Crew Cab Dually: Cummins 12v P-Pump Swap, Compound Turbos, A2W Intercooler, NV4500HD, 4wd conversion, Radius Arms, Coilovers, Crossover Steering, etc Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=803608

07-11-2008, 04:23 PM	#19
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: Auto shift linkage in way of power brake booster The 67-72's have a bellcrank that the pedal pushes on then the bellcrank rod pushes the booster/mc. the mod where you trim the bracket corner is for 3/4 tons. In my opinion on a 1/2 ton you would be better off getting the settup off a 67-72 half ton.

07-11-2008, 08:13 PM	#22
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Auto shift linkage in way of power brake booster How about a hydroboost? http://67-72chevytrucks.com/vboard/s...d.php?t=175714 __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

07-11-2008, 08:35 PM	#23
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Auto shift linkage in way of power brake booster I think there too bulky. Plus all the extra lines that need to be run to the PS pump. I'm convinced myself to go with a powermaster. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. Last edited by Sport/Truck; 07-11-2008 at 08:35 PM.



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07-11-2008, 08:45 PM	#25
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,131	Re: Auto shift linkage in way of power brake booster I'm with Larry in that I was just thinking of hydroboost as an alternative in this situation but I realize the OP already has a unit he wishes to use. I believe there are only two hydro lines to run from the power steering pump to the hydroboost. They work very well and are a smaller diameter package than the conventional vacumn boosters. More clearance for a big block. If the OP is set on using the 73 up assembly he may be able to heat and bend the shifting linkage to gain some clearance. Or trade his unit for the corrrect one for his truck. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

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