The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > Info Center > FAQ > FAQ Truck Tech > 67-72

Web 67-72chevytrucks.com


Closed Thread
 
Thread Tools Display Modes
Old 01-02-2007, 08:31 PM   #1
GMCMAX
Active Member
 
GMCMAX's Avatar
 
Join Date: Jan 2006
Location: Lower Mid-East Ca.
Posts: 326
Brake booster install pics

I converted the 69 to power brakes today, still drum drum. Used a 1/2 ton booster I bought off the parts board.
Parts list: booster & bracket+pushrod, new pushrod boot, vacuum T fitting, 2 ft vacuum hose, booster vacuum check valve if needed.

As it was


The old vacuum connection for the trans, need to install T fitting to hook booster to.


New fitting installed


Have to disconnect push rod under dash for m/c


I removed the pedal stop plate under the dash for working room. The bolt will hit the column, remove the master cyl nuts first so you can push the pedal way down for clearance.


Master cylinder unbolted and moved out of way


Booster bolted to firewall with master cyl, don't forget to get a pushrod boot for power brakes, it's different. Hook the pedal up first, before bolting the unit in, so you can have the pedal down to put the pivot bolt in.


Together inside with new pedal pad


Hooked up outside with vacuum line to new fitting.


Oh yeah, don't forget to adjust the brakelight switch because th e pedal will be slightly lower.
__________________
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".

Last edited by augie; 04-09-2011 at 04:17 PM.
GMCMAX is offline  
Old 04-02-2007, 12:10 PM   #2
Lippyp
English Chevy Owner
 
Lippyp's Avatar
 
Join Date: May 2002
Location: Shropshire, UK/ Lot, France
Posts: 1,829
Re: Brake booster install pics

Hopefully I'll be doing just this soon. Did you need to lengthen any brake lines or was their enough slack to just slip the booster in behind the master? Did you need to re-bleed the brakes afterwards?
__________________
Phil

'67 C10 long fleet.
350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon

2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission
Lippyp is offline  
Old 04-02-2007, 10:48 PM   #3
GMCMAX
Active Member
 
GMCMAX's Avatar
 
Join Date: Jan 2006
Location: Lower Mid-East Ca.
Posts: 326
Re: Brake booster install pics

Lippyp- the lines were long enough, just had to carefully bend and reposition them forward, and since I didn't disconnect them from the master cyl, no bleeding involved!
__________________
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".
GMCMAX is offline  
Old 03-23-2008, 12:24 AM   #4
VA72C10
VA72C10
 
VA72C10's Avatar
 
Join Date: Mar 2008
Location: Midlothian, VA
Posts: 25,028
Re: Brake booster install pics

can you show a pic of the pushrod boot? I am a noob and don't know where that is so i don't know what to look for when i'm picking up parts for this. Thanks!
VA72C10 is offline  
Old 03-23-2008, 09:03 PM   #5
GMCMAX
Active Member
 
GMCMAX's Avatar
 
Join Date: Jan 2006
Location: Lower Mid-East Ca.
Posts: 326
Re: Brake booster install pics

Boot pops into hole in the firewall where the pushrod comes through to the pedal, pic #6
Picture of boot i bought: http://www.gmcpauls.com/pictures/47-...tpowerbstr.jpg
__________________
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".
GMCMAX is offline  
Old 08-06-2008, 01:40 PM   #6
69TowRig
Senior Member
 
Join Date: Jan 2005
Location: Raleigh, NC
Posts: 882
Re: Brake booster install pics

Quote:
Originally Posted by Tynee View Post
So, here's a question. I did this ac ouple months ago, and in the process realized a had a leaking brake hose on the driver's front, so I assumed that was what was causing my brake pedal not to come back up to the top.

Well, I replaced the hose last weekend, and still can't get the pedal back to the top without pulling up with my toe. It'll come up enough to release the brakes, but that's it.

Anybody know what's wrong here? I adjusted the length of the pushrod to both extremes with no change.
I would change the passenger hose as well. It may be collapsing internally and that will partially drag the brake as well as not let the MC return. I had a boss one time that had a hose collapse on the driver's front and would lock up the brake on that wheel. It took a while for it to settle and return. He drove around with the parking brake a lot before he got it fixed!
__________________
-Chris
Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid.
Click HERE for Blazer pics. Click HERE for Nissan Frontier stuff.

Last edited by 69TowRig; 08-06-2008 at 01:40 PM.
69TowRig is offline  
Old 08-06-2008, 02:17 PM   #7
steelhorse
Senior Member
 
steelhorse's Avatar
 
Join Date: Apr 2008
Location: Franklinton NC
Posts: 1,112
Re: Brake booster install pics

Did you use the same hole in the brake pedal?I heard you need to use a different hole in the lever for power brakes.
steelhorse is offline  
Old 08-06-2008, 10:48 PM   #8
GMCMAX
Active Member
 
GMCMAX's Avatar
 
Join Date: Jan 2006
Location: Lower Mid-East Ca.
Posts: 326
Re: Brake booster install pics

Same hole,, tread lightly on the pedal till ya get used to it.......
__________________
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".
GMCMAX is offline  
Old 10-29-2008, 08:31 PM   #9
blazer72
Freedom isn't Free
 
blazer72's Avatar
 
Join Date: Oct 2006
Location: OKC
Posts: 393
Re: Brake booster install pics

Have you experienced any vacuum issues?? I only ask because I've had a few mechanic buddies of mine tell me the brake booster needs it's own dedicated vacuum source. On my stock power brake trucks, the brake booster vacuum is tapped into the backside of the carb. My edelbrock has a port, but it's not the same size as the stock line/tube I pulled from the donor truck.

Just curious. Oh, and I sure wish I would've read your last tech tip before I thought I had finished. had to drop the column and the rod after I was "done" to adjust the switch. I do that kinda stuff alot.
blazer72 is offline  
Old 10-29-2008, 11:14 PM   #10
GMCMAX
Active Member
 
GMCMAX's Avatar
 
Join Date: Jan 2006
Location: Lower Mid-East Ca.
Posts: 326
Re: Brake booster install pics

No vac problems as of yet, my carb didn't have the port iirc, the fitting I used was from a manifold in the shed and looked right.
Only problem I've heard was Longhorn Man lost the booster diaphragm and the vacuum leak fried the piston on the cylinder under the fitting (see pic 2&3) because the fitting is on the intake runner leading to that cylinder. Connected to the carb would distribute a vacuum leak across all cylinders.
__________________
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".
GMCMAX is offline  
Old 10-30-2008, 01:51 AM   #11
ZZ4Blazer
Registered User
 
Join Date: Aug 2004
Location: Akron, OH
Posts: 95
Re: Brake booster install pics

Quote:
Originally Posted by steelhorse View Post
Did you use the same hole in the brake pedal?I heard you need to use a different hole in the lever for power brakes.
I was wondering this as well. I've always heard the pedals were different(atleast different mouting position) for different leverage on power vs manual brakes.

I've got a 67 im gonna be swapping to pb's using the booster and such off my 68. But gonna use a 80's master since Im swapping to those discs in the front. Im gonna try and compare the brake pedals and see if they're actually any different. Good to hear the swap is pretty straight forward.
ZZ4Blazer is offline  
Old 10-30-2008, 03:01 AM   #12
ERASER5
Registered User
 
ERASER5's Avatar
 
Join Date: Jun 2006
Location: Indiana
Posts: 4,105
Re: Brake booster install pics

Quote:
Originally Posted by ZZ4Blazer View Post
I was wondering this as well. I've always heard the pedals were different(atleast different mouting position) for different leverage on power vs manual brakes.
They are. If you look at the booster bracket for our trucks, there is linkage that changes the effective leverage of the pedal.

If you were working on a Chevelle, you would drill a new rod mount hole in the pedal to change the leverage.
__________________
'70 GMC C1500 LWB
Power disc brakes. WooHoo!
Posi 6 Lug Dana 60
ERASER5 is offline  
Old 10-30-2008, 09:39 AM   #13
Luvlegs
Registered User
 
Luvlegs's Avatar
 
Join Date: Sep 2005
Location: North Carolina
Posts: 1,494
Re: Brake booster install pics

My personal experience was great - it was a piece of cake - I spent a week cleaning my stuff up and then a week contemplating doing it... hemming and hawing... it took all of about 45 mintues I think to do it and that was because I looked it over 3 times afterwards to see if I missed anything.
Watch your first trip on the road - I about put myself and the steering wheel through the windshield - to me, it makes a WORLD of difference.
As for a leaking diaphram buring up a valve, would that be why the check valve is in place where the hose meets up with the booster? Or as later models have one inline before the booster?
Attached Images
 
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer"
(you don't always have to state the obvious)

Wear your PPE! You can eat with false teeth but you can't see with a false eye.

1959 Studebaker Silverhawk 350/400
1972 C10 I6 3OTT
2007 Merc CLK350
Luvlegs is offline  
Old 10-30-2008, 10:24 AM   #14
Brad
Out of the carpool lane.
 
Brad's Avatar
 
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,692
Re: Brake booster install pics

Quote:
Originally Posted by ERASER5 View Post
They are. If you look at the booster bracket for our trucks, there is linkage that changes the effective leverage of the pedal.
If you were working on a Chevelle, you would drill a new rod mount hole in the pedal to change the leverage.
So which hole is for pdb- bottom or top, and how far is the 2nd hole from the other hole? I think I need to make another hole in mine and move the rod...
__________________

1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red
1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!)
2000 Honda VFR in the faster yellow!
2008 Husqvarna TE-610
2004 Kawasaki Ninja 250

1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

Brad is offline  
Old 10-30-2008, 10:32 PM   #15
ERASER5
Registered User
 
ERASER5's Avatar
 
Join Date: Jun 2006
Location: Indiana
Posts: 4,105
Re: Brake booster install pics

The truck brake linkage has only one mounting hole on the pedal arm. It is best to look at another truck to get the linkage geometry correct.
__________________
'70 GMC C1500 LWB
Power disc brakes. WooHoo!
Posi 6 Lug Dana 60
ERASER5 is offline  
Old 10-31-2008, 11:35 PM   #16
GMCMAX
Active Member
 
GMCMAX's Avatar
 
Join Date: Jan 2006
Location: Lower Mid-East Ca.
Posts: 326
Re: Brake booster install pics

LUV, the check valve holds vacuum in the booster, if the engine stops, you still have booster power for one stop....the hydroboost has an accumulator for that same reason, it's that gold colored 4" long can that sticks out of the h/b unit.
__________________
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".
GMCMAX is offline  
Closed Thread

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:59 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com