Power brake conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Capitol68 · 07-04-2006, 08:40 PM

Hi
i have all of the stuff to the brake conversion, but I was wondering if I can use my old hard lines to the M/C, are they long enough or do I have enough slack to stretch that far ? Also, I understand that there is a difference in the pedal push rod length, I was smart enough to ask for the donor rod. Thanks Mark

krue · 07-04-2006, 08:55 PM

You should be able to unbolt the m/c from the firewall and move it forward without unhooking the brake lines.

Capitol68 · 07-04-2006, 11:16 PM

Thanks Krue,
I was thinking and hopeing so. Just didnt want to break any lines being the main and only transpo i have.
Mark

Racer X · 07-17-2006, 01:05 PM

Sorry for the first post being here just look & reallized it. Anyways hello to all.

Do you have a list all the needed parts or can you point me to the post. It has been 20 years cense I did one of these & want to make sure I don't forget something.

Anybody ever used a 7" dia. booster in there truck if so what is involved & how did it work for you?

Quote:

Originally Posted by Capitol68

Thanks Krue,
I was thinking and hopeing so. Just didnt want to break any lines being the main and only transpo i have.
Mark

Capitol68 · 07-17-2006, 08:22 PM

Racer,
Welcome, this is a great place for info.
Lets see I got all of my stuff here off the board from members. I got
M/C
mounting brace off of donor
both push rods( pedal to firewall--firewall to M/C ) but I think they make aftermarket adjustable also.
Probably need a new check valve ( cheap at auto store )
then you will need to plumb from the check valve to somewhere for vaccuum, alot of people tee into where auto transmission goes into intake.
Thats about it, if Im missing anything somebody will chime in.
Mark

Racer X · 07-21-2006, 03:25 PM

Thanks I thought that was all I needed.

Can I get away with using a 7" dia. booster? I am getting ready to put in a 396 & a 4L60 trans & would like to have the smaller booster to run tall valve covers. Any idea on what model of vehical to pull a 7" booster from?

Quote:

Originally Posted by Capitol68

Racer,
Welcome, this is a great place for info.
Lets see I got all of my stuff here off the board from members. I got
M/C
mounting brace off of donor
both push rods( pedal to firewall--firewall to M/C ) but I think they make aftermarket adjustable also.
Probably need a new check valve ( cheap at auto store )
then you will need to plumb from the check valve to somewhere for vaccuum, alot of people tee into where auto transmission goes into intake.
Thats about it, if Im missing anything somebody will chime in.
Mark

Capitol68 · 07-22-2006, 10:58 AM

no sorry I have no idea, mine is a 9". Maybe a junkyard ? And do some measureing
Mark

Racer X · 07-23-2006, 06:29 PM

This is the way I am going to try to go. I will post pic's & all the information I collect.

**truckdude239** · 07-23-2006, 09:34 PM

are you planing on using the manual brake mc? i did on mine and have had to replace it with one for power brakes ( i am in the middle of doing this upgrade)

Racer X · 07-24-2006, 12:06 AM

Yea, you need to us a unit from a power system. Along with the proportioning valve from the same system.

Quote:

Originally Posted by truckdude239

are you planing on using the manual brake mc? i did on mine and have had to replace it with one for power brakes ( i am in the middle of doing this upgrade)

07-04-2006, 08:40 PM	#1
Capitol68 Registered User Join Date: Sep 2002 Location: Austin,Tx Posts: 327	Power brake conversion Hi i have all of the stuff to the brake conversion, but I was wondering if I can use my old hard lines to the M/C, are they long enough or do I have enough slack to stretch that far ? Also, I understand that there is a difference in the pedal push rod length, I was smart enough to ask for the donor rod. Thanks Mark __________________ '68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851

07-04-2006, 08:55 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Power brake conversion You should be able to unbolt the m/c from the firewall and move it forward without unhooking the brake lines. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-04-2006, 11:16 PM	#3
Capitol68 Registered User Join Date: Sep 2002 Location: Austin,Tx Posts: 327	Re: Power brake conversion Thanks Krue, I was thinking and hopeing so. Just didnt want to break any lines being the main and only transpo i have. Mark __________________ '68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851

07-17-2006, 08:22 PM	#5
Capitol68 Registered User Join Date: Sep 2002 Location: Austin,Tx Posts: 327	Re: Power brake conversion Racer, Welcome, this is a great place for info. Lets see I got all of my stuff here off the board from members. I got M/C mounting brace off of donor both push rods( pedal to firewall--firewall to M/C ) but I think they make aftermarket adjustable also. Probably need a new check valve ( cheap at auto store ) then you will need to plumb from the check valve to somewhere for vaccuum, alot of people tee into where auto transmission goes into intake. Thats about it, if Im missing anything somebody will chime in. Mark __________________ '68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851

07-22-2006, 10:58 AM	#7
Capitol68 Registered User Join Date: Sep 2002 Location: Austin,Tx Posts: 327	Re: Power brake conversion no sorry I have no idea, mine is a 9". Maybe a junkyard ? And do some measureing Mark __________________ '68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851 Last edited by Capitol68; 07-22-2006 at 10:59 AM.

07-23-2006, 06:29 PM	#8
Racer X Registered User Join Date: Feb 2006 Location: East Centeral Indiana Posts: 15	Re: Power brake conversion This is the way I am going to try to go. I will post pic's & all the information I collect.

07-23-2006, 09:34 PM	#9
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Power brake conversion are you planing on using the manual brake mc? i did on mine and have had to replace it with one for power brakes ( i am in the middle of doing this upgrade) __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube



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