Gettin CONFUSED! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

manimal · 02-04-2007, 07:16 PM

Ok today i went to pick a part and got this braket of a 69? I am wanting to put power disc brakes on my truck,69 1/2 ton 2wd.What do I need for this bracket to work?-Or will it? Thank you.

-Lance

*rage'nrat638* · 02-04-2007, 07:26 PM

that bracket is for a 3/4 ton booster...

the half ton booster bracket looks like this

*rage'nrat638* · 02-04-2007, 07:29 PM

this is the 3/4 booster.. the 3/4 is better it's dual diaphragm

manimal · 02-04-2007, 10:35 PM

So it will work for 1/2t with disc brakes?(the 3/4 ton booster) what a bout a m/c?

manimal · 02-05-2007, 09:42 PM

ttt

gringoloco · 02-06-2007, 02:21 AM

Quote:

Originally Posted by manimal

ttt

Me too. Will a 3/4 bracket work with a 1/2 booster?

manimal · 02-06-2007, 12:46 PM

try this again. please HELP! Can I use a 1969 c20 booster and bracket with a 71-up 1/2t disc braks m/c and prop valve? Thanks

-Lance

BLACK AND BLUE 67-72 · 02-06-2007, 05:50 PM

Still not clearing up the diff between the two brackets??

As with the booster they had the option of a Delco Moraine or a Bendix, the Delco being the single diaphram or the Bendix being a dual diaphram.

BLACK AND BLUE 67-72 · 02-06-2007, 05:59 PM

manimal I don't see any reason why that wouldn't work just fine.

*rage'nrat638* · 02-06-2007, 08:24 PM

ok i am going out to the garage to shoot more pictures.. just for you guy's

*rage'nrat638* · 02-06-2007, 08:38 PM

ok lets see if i can splain

this picture is a 1/2 ton booster bracket

*rage'nrat638* · 02-06-2007, 08:40 PM

this is a 3/4 ton booster bracket

msgross · 02-06-2007, 08:49 PM

tons of posts on this topic...search and ye shall find. From what I understand is a 1/2 ton MC goes with a 1.2 ton booster, and 3/4 ton MC goes with a 3/4 ton booster. Not sure on the brackets but those two are for sure. Now if I remember the two MC's are different front goes to back brakes and back to front on one and opposite on other. All this comes into play when you plumb it. I plan on researching it again prior to my install

*rage'nrat638* · 02-06-2007, 08:51 PM

here is the 1/2 ton booster..you can see the rear rod sticks out much longer than the 3/4 ton booster..

*rage'nrat638* · 02-06-2007, 08:55 PM

the 3/4 ton booster rod sticks out 3 1/4" long i don't have a picture with a tape measure beside it

*rage'nrat638* · 02-06-2007, 09:09 PM

if your going to disk brakes you will need the matching master cyl for the booster your using. designed for disc brakes and provalve.

if using a 3/4 ton booster on a 1/2 ton the lines need reversed.
front to back...back to front

after that your on your own..hope this helped your pal mark

manimal · 02-06-2007, 11:16 PM

Thank You VERY MUCH!!

longhorn71 · 02-06-2007, 11:27 PM

some 3/4tons and 1-tons ran the same booster as the 1/2tons.

manimal · 02-07-2007, 05:19 PM

Just got off the phone with Classic Performance Parts and they told me to get a 1971-72 3/4t disc brake master cylinder and their proportioning valve and use my 69 3/4t booster and I'll be set for disc brakes.They also said to run the lines front res to front on valve and rear res to rear of valve. NOW I AM REALLY CONFUSED!!

manimal · 02-11-2007, 04:01 PM

Here we go again! I just came back from the auto parts store to get a m/c.I looked up a 1971-72 c20 with disc brakes to go with my 1969 booster and brackets-NOT GOING TO WORK! the m/c has a shallow piston and the booster to m/c rod is long.What am I doing wrong here? This is what I have: 1969 C20 2wd booster and brackets(dual diaphram) and want to add disc brakes using these parts to my 1969 C10 2wd with manual drums. Please tell me what I am dooing wrong!?Thank You in advance

-Lance

02-04-2007, 07:16 PM	#1
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Gettin CONFUSED! Ok today i went to pick a part and got this braket of a 69? I am wanting to put power disc brakes on my truck,69 1/2 ton 2wd.What do I need for this bracket to work?-Or will it? Thank you. -Lance Attached Images

02-04-2007, 07:26 PM	#2
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! that bracket is for a 3/4 ton booster... the half ton booster bracket looks like this Last edited by rage'nrat638; 07-12-2007 at 06:58 AM.

02-04-2007, 07:29 PM	#3
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! this is the 3/4 booster.. the 3/4 is better it's dual diaphragm Last edited by rage'nrat638; 07-12-2007 at 06:58 AM.

02-04-2007, 10:35 PM	#4
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gettin CONFUSED! So it will work for 1/2t with disc brakes?(the 3/4 ton booster) what a bout a m/c?

02-05-2007, 09:42 PM	#5
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gettin CONFUSED! ttt

02-06-2007, 12:46 PM	#7
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gettin CONFUSED! try this again. please HELP! Can I use a 1969 c20 booster and bracket with a 71-up 1/2t disc braks m/c and prop valve? Thanks -Lance Last edited by manimal; 02-06-2007 at 12:49 PM.

02-06-2007, 05:50 PM	#8
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Gettin CONFUSED! Still not clearing up the diff between the two brackets?? As with the booster they had the option of a Delco Moraine or a Bendix, the Delco being the single diaphram or the Bendix being a dual diaphram. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

02-06-2007, 05:59 PM	#9
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Gettin CONFUSED! manimal I don't see any reason why that wouldn't work just fine. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

02-06-2007, 08:24 PM	#10
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! ok i am going out to the garage to shoot more pictures.. just for you guy's

02-06-2007, 08:38 PM	#11
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! ok lets see if i can splain this picture is a 1/2 ton booster bracket Last edited by rage'nrat638; 07-12-2007 at 06:57 AM.

02-06-2007, 08:40 PM	#12
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! this is a 3/4 ton booster bracket Last edited by rage'nrat638; 07-12-2007 at 06:57 AM.

02-06-2007, 08:49 PM	#13
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Gettin CONFUSED! tons of posts on this topic...search and ye shall find. From what I understand is a 1/2 ton MC goes with a 1.2 ton booster, and 3/4 ton MC goes with a 3/4 ton booster. Not sure on the brackets but those two are for sure. Now if I remember the two MC's are different front goes to back brakes and back to front on one and opposite on other. All this comes into play when you plumb it. I plan on researching it again prior to my install __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

02-06-2007, 08:51 PM	#14
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! here is the 1/2 ton booster..you can see the rear rod sticks out much longer than the 3/4 ton booster.. Last edited by rage'nrat638; 07-12-2007 at 06:57 AM.

02-06-2007, 08:55 PM	#15
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! the 3/4 ton booster rod sticks out 3 1/4" long i don't have a picture with a tape measure beside it Last edited by rage'nrat638; 07-12-2007 at 06:57 AM.

02-06-2007, 09:09 PM	#16
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Gettin CONFUSED! if your going to disk brakes you will need the matching master cyl for the booster your using. designed for disc brakes and provalve. if using a 3/4 ton booster on a 1/2 ton the lines need reversed. front to back...back to front after that your on your own..hope this helped your pal mark



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02-06-2007, 11:16 PM	#17
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gettin CONFUSED! Thank You VERY MUCH!!

02-06-2007, 11:27 PM	#18
longhorn71 Senior Member Join Date: Sep 2004 Location: CANADA Posts: 1,681	Re: Gettin CONFUSED! some 3/4tons and 1-tons ran the same booster as the 1/2tons.

02-07-2007, 05:19 PM	#19
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gettin CONFUSED! Just got off the phone with Classic Performance Parts and they told me to get a 1971-72 3/4t disc brake master cylinder and their proportioning valve and use my 69 3/4t booster and I'll be set for disc brakes.They also said to run the lines front res to front on valve and rear res to rear of valve. NOW I AM REALLY CONFUSED!!

02-11-2007, 04:01 PM	#20
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gettin CONFUSED! Here we go again! I just came back from the auto parts store to get a m/c.I looked up a 1971-72 c20 with disc brakes to go with my 1969 booster and brackets-NOT GOING TO WORK! the m/c has a shallow piston and the booster to m/c rod is long.What am I doing wrong here? This is what I have: 1969 C20 2wd booster and brackets(dual diaphram) and want to add disc brakes using these parts to my 1969 C10 2wd with manual drums. Please tell me what I am dooing wrong!?Thank You in advance -Lance

Register or Log In To remove these advertisements.