67 gmc non power brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

camaney · 10-21-2009, 10:44 PM

ok i have a 67 gmc with no power brakes and i got the brackets for the booster but no booster from a 71 or 72 chevy. the question is what else do i need besides the booster to make it power brakes? thanks

**LockDoc** · 10-21-2009, 10:57 PM

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If you are going to keep the drum brakes you need a complete setup from a truck with power drum brakes, including the proportioning valve and rod that fastens to the brake pedal.

LockDoc

wp silverado · 10-21-2009, 11:06 PM

exactly^^^ your going to need a proportioning valve for power brakes (drum or disc) along with the rod from the back of the master

mclairmo · 10-22-2009, 08:47 PM

There is no difference between and power or non-power combination valve/proportioning valve. The only difference is between disc and drum since the disc version does not need a residual valve for the front brakes. Discs in front don't need a residual valve. Drums need one. I converted to power on my all drum 68 C10 and used the existing valve. No issues. Just be sure you have all the linkage connecting the booster to the pedal.

Tx Firefighter · 10-22-2009, 08:56 PM

First two are wrong, mclairmo is right. You unbolt the existing master cylinder and brake line junction block from the firewall and bolt it onto the new booster. The lines will have enough flex in them to fit further from the firewall due to the booster. There is no change in master cylinder, lines, or anything else.

**LockDoc** · 10-22-2009, 10:04 PM

Quote:

Originally Posted by Tx Firefighter

First two are wrong, mclairmo is right. You unbolt the existing master cylinder and brake line junction block from the firewall and bolt it onto the new booster. The lines will have enough flex in them to fit further from the firewall due to the booster. There is no change in master cylinder, lines, or anything else.

I guess I had a brain fart... This is exactly how I did the White Truck 3 or 4 years ago... Nobody ever accused me of being too smart...

LockDoc

camaney · 10-22-2009, 10:28 PM

so if i get the power booster from the auto parts store it allready comes with the rod in it?

Tx Firefighter · 10-22-2009, 10:37 PM

No, you need the linkage and brackets too. On these trucks there is an intermediate bellcrank linkage and spacer brackets between the booster and firewall.

That stuff is only available new. You can find it on the parts board or send teeitup a message and see if he still has a bunch of them around.

mclairmo · 10-23-2009, 01:04 AM

Quote:

Originally Posted by camaney

so if i get the power booster from the auto parts store it allready comes with the rod in it?

No, just the booster, no brackets, linkage, bellcrank, rod, etc. I bought a complete used booster off Ebay with all the brackets, linkage, bellcrank and rod included and replaced the junk booster with a rebuilt from Autozone for $99.

5W0P3 · 10-23-2009, 03:04 AM

Can we get a pic of this stuff? I'm pretty confused now that I dont have everything I need. (assuming 67 and 68 are the same)

wp silverado · 10-23-2009, 10:09 AM

notice in this pic how far off the firewall it is,

this pic too,

camaney · 10-23-2009, 10:30 PM

thank you. all you guys are good

GMCMAX · 10-23-2009, 10:59 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=221598
Did this on the 68 and 69
Max

**Captainfab** · 10-23-2009, 11:33 PM

If any of you either can't find the original boosters and brackets, or just want the booster closer to the firewall, let me know, I make a bracket for power brakes on the '67-'72's. A link to the for sale thread is in my sig.

10-21-2009, 10:44 PM	#1
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	67 gmc non power brakes ok i have a 67 gmc with no power brakes and i got the brackets for the booster but no booster from a 71 or 72 chevy. the question is what else do i need besides the booster to make it power brakes? thanks

10-21-2009, 10:57 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: 67 gmc non power brakes - If you are going to keep the drum brakes you need a complete setup from a truck with power drum brakes, including the proportioning valve and rod that fastens to the brake pedal. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

10-21-2009, 11:06 PM	#3
wp silverado Registered User Join Date: Oct 2009 Location: sykesville MD Posts: 200	Re: 67 gmc non power brakes exactly^^^ your going to need a proportioning valve for power brakes (drum or disc) along with the rod from the back of the master __________________ 1967 c-10-built smallblock, backed by m-21, lowered 2005 silverado-tint, exhaust, lift, 35's 1964 c-10 shortbed project

10-22-2009, 08:47 PM	#4
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: 67 gmc non power brakes There is no difference between and power or non-power combination valve/proportioning valve. The only difference is between disc and drum since the disc version does not need a residual valve for the front brakes. Discs in front don't need a residual valve. Drums need one. I converted to power on my all drum 68 C10 and used the existing valve. No issues. Just be sure you have all the linkage connecting the booster to the pedal.

10-22-2009, 08:56 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 67 gmc non power brakes First two are wrong, mclairmo is right. You unbolt the existing master cylinder and brake line junction block from the firewall and bolt it onto the new booster. The lines will have enough flex in them to fit further from the firewall due to the booster. There is no change in master cylinder, lines, or anything else. __________________ I'm on the Instagram- @Gearhead_Kevin

10-22-2009, 10:28 PM	#7
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	Re: 67 gmc non power brakes so if i get the power booster from the auto parts store it allready comes with the rod in it?

10-22-2009, 10:37 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 67 gmc non power brakes No, you need the linkage and brackets too. On these trucks there is an intermediate bellcrank linkage and spacer brackets between the booster and firewall. That stuff is only available new. You can find it on the parts board or send teeitup a message and see if he still has a bunch of them around. __________________ I'm on the Instagram- @Gearhead_Kevin

10-23-2009, 03:04 AM	#10
5W0P3 Registered User Join Date: Oct 2009 Location: Bedford, TX Posts: 14	Re: 67 gmc non power brakes Can we get a pic of this stuff? I'm pretty confused now that I dont have everything I need. (assuming 67 and 68 are the same)

10-23-2009, 10:09 AM	#11
wp silverado Registered User Join Date: Oct 2009 Location: sykesville MD Posts: 200	Re: 67 gmc non power brakes notice in this pic how far off the firewall it is, this pic too, __________________ 1967 c-10-built smallblock, backed by m-21, lowered 2005 silverado-tint, exhaust, lift, 35's 1964 c-10 shortbed project

10-23-2009, 10:30 PM	#12
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	Re: 67 gmc non power brakes thank you. all you guys are good

10-23-2009, 10:59 PM	#13
GMCMAX Active Member Join Date: Jan 2006 Location: Lower Mid-East Ca. Posts: 326	Re: 67 gmc non power brakes http://67-72chevytrucks.com/vboard/s...d.php?t=221598 Did this on the 68 and 69 Max __________________ Never try to teach a pig to sing; it wastes your time and annoys the pig! Gets More Chicks My lugnuts require more torque than your honda makes! 68 GMC, 4X4 conversion w/73 k20 running gear and springs, 350 4spd, 4.10's, D44 powerlok front, 14BFF govlock rear, 33" tires, lifted 4".

10-23-2009, 11:33 PM	#14
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: 67 gmc non power brakes If any of you either can't find the original boosters and brackets, or just want the booster closer to the firewall, let me know, I make a bracket for power brakes on the '67-'72's. A link to the for sale thread is in my sig. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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